scholarly journals Clinical characteristics, outcomes, and risk factors for mortality in hospitalized patients with COVID-19 and cancer history: a propensity score-matched study

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Majid Sorouri ◽  
Amir Kasaeian ◽  
Helia Mojtabavi ◽  
Amir Reza Radmard ◽  
Shadi Kolahdoozan ◽  
...  

Abstract Background COVID-19 has caused great concern for patients with underlying medical conditions. We aimed to determine the prognosis of patients with current or previous cancer with either a PCR-confirmed COVID-19 infection or a probable diagnosis according to chest CT scan. Methods We conducted a case control study in a referral hospital on confirmed COVID-19 adult patients with and without a history of cancer from February25th to April21st, 2020. Patients were matched according to age, gender, and underlying diseases including ischemic heart disease (IHD), diabetes mellitus (DM), and hypertension (HTN). Demographic features, clinical data, comorbidities, symptoms, vital signs, laboratory findings, and chest computed tomography (CT) images have been extracted from patients’ medical records. Multivariable logistic regression was used to estimate odd ratios and 95% confidence intervals of each factor of interest with outcomes. Results Fifty-three confirmed COVID-19 patients with history of cancer were recruited and compared with 106 non-cancerous COVID-19 patients as controls. Male to female ratio was 1.33 and 45% were older than 65. Dyspnea and fever were the most common presenting symptoms in our population with 57.86 and 52.83% respectively. Moreover, dyspnea was significantly associated with an increased rate of mortality in the cancer subgroup (p = 0.013). Twenty-six patients (49%) survived among the cancer group while 89 patients (84%) survived in control (p = 0.000). in cancer group, patients with hematologic cancer had 63% mortality while patients with solid tumors had 37%. multivariate analysis model for survival prediction showed that history of cancer, impaired consciousness level, tachypnea, tachycardia, leukocytosis and thrombocytopenia were associated with an increased risk of death. Conclusion In our study, cancer increased the mortality rate and hospital stay of COVID-19 patients and this effect remains significant after adjustment of confounders. Compared to solid tumors, hematologic malignancies have been associated with worse consequences and higher mortality rate. Clinical and para-clinical indicators were not appropriate to predict death in these patients.

2020 ◽  
Author(s):  
Majid Sorouri ◽  
Amir Kasaeian ◽  
Helia Mojtabavi ◽  
Amir Reza Radmard ◽  
Shadi Kolahdoozan ◽  
...  

Abstract Background: COVID-19 has caused great concern for patients with underlying medical conditions. We aimed to determine the prognosis of patients with current or previous cancer with either a PCR-confirmed COVID-19 infection or a probable diagnosis according to chest CT scan.Methods: We conducted a case control study in a referral hospital on confirmed COVID-19 adult patients with and without a history of cancer from February25th to April21st, 2020. Patients were matched according to age, gender, and underlying diseases. Demographic features, clinical and Para clinical data have been extracted from medical records. Multivariable logistic regression was used to estimate odd ratios and 95% confidence intervals of each factor of interest with outcomes. Results: Fifty-three confirmed COVID-19 patients with history of cancer were recruited and compared with 106 non-cancerous COVID-19 patients. Male to female ratio was 1.33 and 45% were older than 65. Dyspnea was significantly associated with an increased rate of mortality in the cancer subgroup (p=0.013). Twenty-six patients (49%) survived among the cancer group while 89 patients (84%) survived in control (p=0.000). Patients with hematologic cancer had 63% mortality while those with solid tumors had 37%. Multivariate analysis showed that cancer, impaired consciousness, tachypnea, tachycardia, leukocytosis and thrombocytopenia were associated with an increased risk of death.Conclusion: Cancer increased mortality rate and hospital stay of COVID-19 patients and remained significant after adjustment of confounders. Compared to solid tumors, hematologic malignancies have been associated with worse consequences and higher mortality. Clinical and Para clinical indicators were not appropriate to predict death.


2009 ◽  
Vol 27 (15_suppl) ◽  
pp. 10029-10029
Author(s):  
S. L. Eichstadt ◽  
G. V. Dahl ◽  
P. G. Fisher ◽  
J. M. Ford ◽  
J. D. Schiffman

10029 Background: The association between family history of cancer (FHC) and outcome remains uncertain. Relapse and survival of children with FHC has not been well studied. Such information would be valuable for prognosis, refining treatment protocols, and long-term follow-up in pediatric patients with FHC. Methods: An historical cohort study of all pediatric patients diagnosed with cancer at Lucile Packard Children's Hospital at Stanford from 1999 - 2002 was performed (n = 363, mean age: 8.4 yrs [0–28 yrs]). FHC among 1st, 2nd and 3rd degree relatives was obtained from the first 10 consecutive encounters in the electronic medical record. Relapse, secondary malignancy, and survival data were also acquired. The relative risks for these endpoints were calculated between patients with FHC among 1st and/or 2nd degree relatives and those with negative FHC. Patients without documented FHC were excluded (n = 100). Results: 108 (41%) newly diagnosed pediatric patients had reported FHC (1st Degree: n = 14 [5%], 2nd Degree: n = 58 [22%], 3rd Degree: n = 36 [14%]). Patients with reported FHC among 1st and/or 2nd degree relatives were at increased relative risk [RR] for relapse (1.96, 95% confidence interval [CI] 1.27–3.02) compared to patients with negative FHC (n = 191). In particular, patients with Hodgkin Disease (HD) and FHC (n = 12) were more likely to relapse (RR 1.79, 95% CI 1.19–2.72) and at increased risk of death (RR 1.72, 95% CI 1.18–2.53), compared to HD with negative FHC (n = 8). Similarly, patients diagnosed with ALL and FHC (n = 22) had increased risk of death (RR 2.25, 95% CI 1.06–4.8) compared to ALL patients with negative FHC (n = 56). For patients diagnosed with any pediatric cancer and positive FHC in 1st degree relative, RR of death was significantly elevated (3.74, 95% CI 1.20–11.70). Conclusions: Pediatric cancer patients with positive FHC among 1st and/or 2nd degree relatives appear to have higher relative risk of relapse compared to those with negative FHC. Additionally, an increased risk of death was associated with HD and ALL patients with positive FHC. Patients with 1st degree relative with malignancy had an increased risk for death compared to those without cancer among 1st degree relatives. These findings may reflect underlying genetic predispositions in children which contribute to outcome. No significant financial relationships to disclose.


2020 ◽  
Vol 12 ◽  
pp. 175883592095680 ◽  
Author(s):  
Nalinie Joharatnam-Hogan ◽  
Daniel Hochhauser ◽  
Kai-Keen Shiu ◽  
Hannah Rush ◽  
Valerie Crolley ◽  
...  

Background: This study aims to compare the outcomes of COVID-19-positive disease in patients with a history of cancer to those without. Methods: We retrospectively collected clinical data and outcomes of COVID-19 positive cancer patients treated consecutively in five North London hospitals (cohort A). Outcomes recorded included time interval between most recent anti-cancer treatment and admission, severe outcome [a composite endpoint of intensive care unit (ITU) admission, ventilation and/or death] and mortality. Outcomes were compared with consecutively admitted COVID-19 positive patients, without a history of cancer (cohort B), treated at the primary centre during the same time period (1 March–30 April 2020). Patients were matched for age, gender and comorbidity. Results: The median age in both cohorts was 74 years, with 67% male, and comprised of 30 patients with cancer, and 90 without (1:3 ratio). For cohort B, 579 patients without a history of cancer and consecutively admitted were screened from the primary London hospital, 105 were COVID-19 positive and 90 were matched and included. Excluding cancer, both cohorts had a median of two comorbidities. The odds ratio (OR) for mortality, comparing patients with cancer to those without, was 1.05 [95% confidence interval (CI) 0.4–2.5], and severe outcome (OR 0.89, 95% CI 0.4–2.0) suggesting no increased risk of death or a severe outcome in patients with cancer. Cancer patients who received systemic treatment within 28 days had an OR for mortality of 4.05 (95% CI 0.68–23.95), p = 0.12. On presentation anaemia, hypokalaemia, hypoalbuminaemia and hypoproteinaemia were identified predominantly in cohort A. Median duration of admission was 8 days for cancer patients and 7 days for non-cancer. Conclusion: A diagnosis of cancer does not appear to increase the risk of death or a severe outcome in COVID-19 patients with cancer compared with those without cancer. If a second spike of virus strikes, rational decision making is required to ensure optimal cancer care.


Open Heart ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. e001526
Author(s):  
Elena Tessitore ◽  
David Carballo ◽  
Antoine Poncet ◽  
Nils Perrin ◽  
Cedric Follonier ◽  
...  

ObjectiveHistory of cardiovascular diseases (CVDs) may influence the prognosis of patients hospitalised for COVID-19. We investigated whether patients with previous CVD have increased risk of death and major adverse cardiovascular event (MACE) when hospitalised for COVID-19.MethodsWe included 839 patients with COVID-19 hospitalised at the University Hospitals of Geneva. Demographic characteristics, medical history, laboratory values, ECG at admission and medications at admission were collected based on electronic medical records. The primary outcome was a composite of in-hospital mortality or MACE.ResultsMedian age was 67 years, 453 (54%) were males and 277 (33%) had history of CVD. In total, 152 (18%) died and 687 (82%) were discharged, including 72 (9%) who survived a MACE. Patients with previous CVD were more at risk of composite outcomes 141/277 (51%) compared with those without CVD 83/562 (15%) (OR=6.0 (95% CI 4.3 to 8.4), p<0.001). Multivariate analyses showed that history of CVD remained an independent risk factor of in-hospital death or MACE (OR=2.4; (95% CI 1.6 to 3.5)), as did age (OR for a 10-year increase=2.2 (95% CI 1.9 to 2.6)), male gender (OR=1.6 (95% CI 1.1 to 2.3)), chronic obstructive pulmonary disease (OR=2.1 (95% CI 1.0 to 4.2)) and lung infiltration associated with COVID-19 at CT scan (OR=1.9 (95% CI 1.2 to 3.0)). History of CVD (OR=2.9 (95% CI 1.7 to 5)), age (OR=2.5 (95% CI 2.0 to 3.2)), male gender (OR=1.6 (95% CI 0.98 to 2.6)) and elevated C reactive protein (CRP) levels on admission (OR for a 10 mg/L increase=1.1 (95% CI 1.1 to 1.2)) were independent risk factors for mortality.ConclusionHistory of CVD is associated with higher in-hospital mortality and MACE in hospitalised patients with COVID-19. Other factors associated with higher in-hospital mortality are older age, male sex and elevated CRP on admission.


2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 1224.3-1225
Author(s):  
J. Nossent ◽  
D. Preen ◽  
W. Raymond ◽  
H. Keen ◽  
C. Inderjeeth

Background:IgA vasculitis is generally considered to be a self-limiting condition, but this is at odds with the increased mortality observed in adult patients with IgA vasculitis (1).Objectives:With sparse data on prognostic factors in IgAV, we investigated whether pre-existing conditions are risk factors for mortality in adult IgAV patients.Methods:Observational population-based cohort study using state-wide linked longitudinal health data for adults with IgAV (n=267) and matched controls (n=1080) between 1980-2015. Charlson comorbidity index (CCI) and serious infections (SI) were recorded over an extensive lookback period prior to diagnosis. Date and causes of death were extracted from the WA Death Registry. Mortality rate (deaths/1000 person-years) ratios (MRR) and time dependent survival analysis assessed the risk of death. Age and gender specific mortality rate data were obtained from the Australian Bureau of Statistics.Results:During 9.9 (±9.8) years lookback IgAV patients accrued higher CCI scores (2.60 vs1.50 p<0.001) and had higher risk of SI (OR 8.4, p<0.001), not fully explained by CCI scores. During 19 years follow-up, the risk of death in IgAV patients (n=137) was higher than in controls (n=397) (MRR 2.06, CI 1.70-2.50, p<0.01) and the general population (SMRR 5.64, CI 4.25, 7.53, p<0.001). Survival in IgAV was reduced at five (72.7 vs. 89.7 %) and twenty years (45.2% vs. 65.6 %) (both p<0.05). CCI (HR1.88, CI:1.25 - 2.73, p=0.001), renal failure (HR 1.48, CI: 1.04 - 2.22, p=0.03) and prior SI (HR 1.48, CI:1.01 – 2.16, p=0.04) were independent risk factors. Death from infections (5.8 vs 1.8%, p=0.02) was significantly more frequent in IgAV patients.Conclusion:Premorbid accrual of comorbidity is increased and predicts premature death in IgAV patients. However, comorbidity does not fully explain the increased risk of serious infections prior to diagnosis or the increased mortality due to infections in IgAV.References:[1]Villatoro-Villar M, Crowson CS, Warrington KJ, Makol A, Ytterberg SR, Koster MJ. Clinical Characteristics of Biopsy-Proven IgA Vasculitis in Children and Adults: A Retrospective Cohort Study. Mayo Clin Proc. 2019;94(9):1769-80.Acknowledgements:The authors would like to acknowledge the support of the Arthritis Foundation of WA and acknowledge the Western Australian Data Linkage Branch, the Western Australian Department of Health, and the data custodians of, the Hospital and Morbidity Data Collection, the Emergency Department Data Collection the WA Cancer Register and the WA Death Register for their assistance with the study.Disclosure of Interests:None declared


Author(s):  
Wesley T O’Neal ◽  
J’Neka Claxton ◽  
Richard MacLehose ◽  
Lin Chen ◽  
Lindsay G Bengtson ◽  
...  

Background: Early cardiology involvement within 90 days of atrial fibrillation (AF) diagnosis is associated with greater likelihood of oral anticoagulant use and a reduced risk of stroke. Due to variation in cardiovascular care for patients with cancer, it is possible that a similar association does not exist for AF patients with cancer. Methods: We examined the association of early cardiology involvement with oral anticoagulation use among non-valvular AF patients with history of cancer (past or active), using data from 388,045 patients (mean age=68±15 years; 59% male) from the MarketScan database (2009-2014). ICD-9 codes in any position were used to identify cancer diagnosis prior to AF diagnosis. Provider specialty and filled anticoagulant prescriptions 3 months prior to and 6 months after AF diagnosis were obtained. Poisson regression models were used to compute the probability of an oral anticoagulant prescription fill and Cox regression was used to estimate the risk of stroke and major bleeding. Results: A total of 64,016 (17%) AF patients had a prior history of cancer. Cardiology involvement was less likely to occur among patients with history of cancer than those without (relative risk=0.92, 95% confidence interval (0.91, 0.93)). Similar differences were observed for cancers of the colon (0.90 (0.88, 0.92)), lung (0.76 (0.74, 0.78)), pancreas (0.74 (0.69, 0.80)), and hematologic system (0.88 (0.87, 0.90)), while no differences were observed for breast or prostate cancers. Patients with cancer were less likely to fill prescriptions for anticoagulants (0.89 (0.88, 0.90)) than those without cancer, and similar results were observed for cancers of the colon, lung, prostate, pancreas, and hematologic system. However, patients with cancer were more likely to fill prescriptions for anticoagulants (1.48 (1.45, 1.52)) if seen by a cardiology provider, regardless of cancer type. A reduced risk of stroke (hazard ratio=0.89 (0.81, 0.99)) was observed among all cancer patients who were seen by a cardiology provider than among those who were not, without an increased risk of bleeding (1.04 (0.95, 1.13)). Conclusion: AF patients with cancer were less likely to see a cardiologist, and less likely to fill an anticoagulant prescription than AF patients without cancer. However, cardiology involvement was associated with increased anticoagulant prescription fills and reduced risk of stroke, suggesting a beneficial role for cardiology providers to improve outcomes in AF patients with history of cancer.


2021 ◽  
Vol 39 (15_suppl) ◽  
pp. e16095-e16095
Author(s):  
Anbarasan Sekar ◽  
Akhil Rajendra ◽  
Vanita Noronha ◽  
Smruti Mokal ◽  
Vijay Maruti Patil ◽  
...  

e16095 Background: There has been a definite histopathological shift in esophageal cancer in the West over the past few decades, with adenocarcinoma overtaking squamous cell carcinoma as the commonest type. Asian countries with a high human development index like China have also reported an increased incidence of esophageal adenocarcinoma. Data on the epidemiology of esophageal cancer in India are limited. Methods: We retrospectively evaluated the data of all patients with histologically proven esophageal cancer at Tata Memorial Hospital, from 2003 to 2018. We excluded non-squamous and non-adenocarcinoma histologies. Results: Of a total of 7,874 patients with esophageal cancer, 5,092 (64.7%) were men, for a male to female ratio of 2.5:1. The median age was 57 years (IQR, 50-65); 4,465 (56.7%) were below 60 years old. Of the 4912 patients in whom a history of tobacco or alcohol use had been elicited, there were 1,360 (27.7%) patients with no history of substance use. The site of the primary was the upper third in 906 (12.8%), middle third esophagus in 2,942 (41.5%), lower third in 2,331 (32.8%) and gastroesophageal junction in 917 (12.9%) patients. The predominant histology was squamous cell carcinoma in 6,413 (81.4%) patients and adenocarcinoma in 1461 (18.6%). There was no change in the histologic pattern over the period of the study; squamous cell carcinoma constituted 78.5% of the cases in 2003, and 85.5% in 2018; Chi square test for the year wise trend in histologic patterns was not significant, p=0.143. Evaluation of the histologic subtype according to sex revealed that in the male patients, there were 3890 (76.4%) squamous and 1202 (23.6%) adenocarcinoma cases, while in female patients, there were 2523 (90.7%) squamous and 259 (9.3%) adenocarcinoma cases. On a uni variate analysis, male sex (p<0.001), a history of tobacco or alcohol use (p<0.001), and the presence of comorbidity (p<0.007) were associated with an increased risk of squamous cell carcinoma. Multivariate analysis by logistic regression model revealed that female sex and use of tobacco or alcohol were positively associated with squamous cell carcinoma, while the presence of comorbities and primary in lower esophagus/GEJ were positively associated with adenocarcinoma. Conclusions: Squamous cell carcinoma continues to be the commonest esophageal cancer histologic subtype in over 80% Indian patients. The mid esophagus is the most common site (42%). There is no evidence of an epidemiological shift or an increase in the occurrence of adenocarcinoma or of lower esophageal/GEJ malignancy over the past two decades.


Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 3463-3463
Author(s):  
Micah Denay McCumber ◽  
Aaron Mark Wendelboe ◽  
Janis Campbell ◽  
Kai Ding ◽  
Michele G Beckman ◽  
...  

Background: Patients with cancer are at elevated risk for venous thromboembolism (VTE). Active cancer contributes a 4-7 fold increased risk for VTE; however, the incidence of VTE stratified by subpopulations of patients diagnosed with cancer, especially race/ethnicity, is uncertain. Objective: Describe the incidence of VTE among adult patients (age ≥ 18 years) with a cancer diagnosis in Oklahoma County, OK according to age, gender, race, and cancer type. Methods: In collaboration with the Centers for Disease Control and Prevention, we established a population-based surveillance system for VTE in Oklahoma County, OK between April 1, 2012-March 31, 2014 to estimate the incidences of first-time and recurrent VTE events. The Commissioner of Health made VTE a reportable condition and delegated surveillance-related responsibilities to the University of Oklahoma, College of Public Health. Active surveillance involved reviewing imaging studies (e.g., chest computed tomography and compression ultrasounds of the extremities) from all inpatient and outpatient facilities in the county and collecting demographic, treatment and risk factor data on all VTE case-patients. Patients were linked to the Oklahoma Central Cancer Registry. Any patient with a cancer diagnosis since 1997, excluding basal or squamous cell carcinoma, were included in the population-at-risk. Active cancer was defined as metastatic or a diagnosis ≤6 months before their VTE diagnosis. Poisson regression was used to estimate incidence rates (IRs) and 95% confidence intervals (CIs), which are reported per 1,000 person years (PY). Estimates with &lt;10 events were suppressed. Results: Among all patients aged ≥18 years with a cancer diagnosis since 1997, 1.5% (n = 881) had a VTE event during the 2-year surveillance period. The overall annual age-adjusted incidence of VTE among those with cancer was 6.8 per 1,000 PY (95% CI: 5.81, 7.95). The demographic-specific incidence rates are summarized in Table 1. The VTE incidence did not significantly differ by sex. When stratified by age, annual VTE incidence was similar among those aged 18-39 years (6.1/1,000 PY, 95% CI: 4.35, 8.61), 40-59 years (6.2/1,000 PY, 95% CI: 5.4, 7.14), and 60-79 years (7.2/1,000 PY, 95% CI: 6.55, 7.90), however, the incidence was significantly higher (p&lt;0.05) in those aged 80+ years (10.1/1,000 PY, 95% CI: 8.77, 11.61). When patients with a cancer diagnosis were stratified by race/ethnicity, non-Hispanic blacks had the highest VTE incidence (11.7/1,000 PY, 95% CI: 10.00, 13.59), followed by Hispanics (8.0/1,000 PY, 95% CI: 5.66, 11.44), non-Hispanic whites (6.9/1,000 PY, 95% CI: 6.41, 7.48), other non-Hispanic/unknown (5.8/1,000 PY, 95% CI: 3.45, 9.85), and non-Hispanic Native Americans (2.6/1,000 PY, 95% CI: 1.39, 4.79). VTE incidence was highest among those with active cancer or a history of cancer within the past three years, after which it appeared to decrease. When stratified by primary cancer type, VTE incidence was highest among those with brain cancer (16.6/1,000 PY, 95% CI: 11.06, 25.04) and lowest among those with prostate cancer (5.2/1,000 PY, 95% CI: 4.20, 6.44). As shown in Table 2, when stratified by cancer type, the incidence of VTE was higher (non-overlapping CIs) among those with active cancer compared to those with a history of cancer &gt;6 months for several tumor types. Discussion: The incidence of VTE among those with cancer differs by race/ethnicity, with non-Hispanic blacks bearing the highest burden of disease. The risk of VTE persists and is particularly elevated up to three years after a cancer diagnosis. Disclosures Raskob: Eli Lilly: Consultancy; Pfizer: Consultancy, Honoraria; Portola: Consultancy; Novartis: Consultancy; BMS: Consultancy, Honoraria; Janssen R&D, LLC: Consultancy, Honoraria; Tetherex: Consultancy; Daiichi Sankyo: Consultancy, Honoraria; Anthos: Consultancy; Bayer Healthcare: Consultancy, Honoraria; Boehringer Ingelheim: Consultancy.


ESC CardioMed ◽  
2018 ◽  
pp. 2111-2116
Author(s):  
Darae Ko ◽  
Emelia Benjamin

Atrial fibrillation (AF) poses a substantial public health burden worldwide. About one in four adults over the age of 40 years are expected to develop AF during their lifetime. The risk for developing AF is higher in men compared to women. Globally, individuals of European ancestry appear to have a higher risk of AF onset than individuals from other racial/ethnic descents. Factors predisposing to AF include family history of AF, standard cardiovascular risk factors, and structural heart disease. Hypertension and obesity explain one-third of AF cases in high-income countries. AF can have devastating consequences including an increased risk of death; cardiovascular complications, such as stroke, systemic thromboembolism, heart failure, myocardial infarction, and sudden cardiac death; and non-cardiovascular complications, such as chronic kidney disease, cognitive impairment and dementia, and poor quality of life. There are major research opportunities to develop an evidence base to effectively prevent and manage AF and its outcomes.


Author(s):  
Erik J. Garcia ◽  
Warren J. Ferguson

Traditionally the domain of consultation/ liaison psychiatry, the challenge of recognizing and then appropriately treating the psychiatric complications of general medical disorders requires thoughtful planning and attention in corrections. Medical conditions that have psychiatric symptoms represent a significant diagnostic dilemma, particularly in the correctional health setting. Over half of the inmates in the United States have symptoms of a major mental illness, but the pervasiveness of substance use disorders, the increasing prevalence of elderly inmates, and limited access to a patient’s past medical and psychiatric records all contribute to the challenge of discerning when a psychiatric presentation results from an underlying medical condition. One early study underscored this challenge, noting that 46% of the patients admitted to community psychiatric wards had an unrecognized medical illness that either caused or exacerbated their psychiatric illness. A more recent study observed that 2.8% of admissions to inpatient psychiatry were due to unrecognized medical conditions. Emergency room medical clearance of patients presenting for psychiatric admission has revealed an increased risk for such underlying medical conditions among patients with any of five characteristics: elderly, a history of substance abuse, no prior history of mental illness, lower socioeconomic status, or significant preexisting medical illnesses. This chapter examines several of these risk groups and focuses on the presenting symptoms of delirium, mood disorders, and psychosis and the underlying medical conditions that can mimic or exacerbate them.


Sign in / Sign up

Export Citation Format

Share Document