[Strengthening the epidemiological study on asthma].
Chen
P
P
D000293:Adolescent; D000328:Adult; D000368:Aged; D001249:Asthma / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D004812:Epidemiologic Methods; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged