[Epidemiologic analysis of 72 cases of epidemic pneumonitis with obstructive asthma].
D001249:Asthma / Q000150:complications / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D002681:China; D005260:Female; D006801:Humans; D008297:Male; D011014:Pneumonia / Q000150:complications / Q000453:epidemiology*; D013997:Time Factors