P7‐53: Association between vitamin D level and respiratory symptom in patients with stable chronic obstructive pulmonary disease
2012 ◽
Vol 156
(12)
◽
pp. 904
2019 ◽
Vol Volume 14
◽
pp. 1495-1501
◽
2015 ◽
Vol 64
(4)
◽
pp. 805-812
◽
2012 ◽
Vol 185
(3)
◽
pp. 286-290
◽
2012 ◽
Vol 156
(12)
◽
pp. 904