[Prevalence of asthma in the city of Porto--regional differences and precipitating factors of asthma].
Delgado
L
L
Cuesta
C
C
Vaz
M
M
D001249:Asthma / Q000453:epidemiology* / Q000276:immunology; D006801:Humans; D011174:Portugal / Q000453:epidemiology; D015995:Prevalence
Prevalencia da asma na cidade do Porto--diferenças regionais e factores precipitantes da asma.