A CASE-CROSSOVER STUDY BETWEEN AIR POLLUTION AND HOSPITAL EMERGENCY ROOM VISITS BY ASTHMA ATTACK

Epidemiology ◽  
2000 ◽  
Vol 11 (4) ◽  
pp. S73
1993 ◽  
Vol 147 (4) ◽  
pp. 826-831 ◽  
Author(s):  
Joel Schwartz ◽  
Daniel Slater ◽  
Timothy V. Larson ◽  
William E. Pierson ◽  
Jane Q. Koenig

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