Epidemiologic studies of obstructive ventilatory disease of the lung. I. A review of concepts and nomenclature.
D001249:Asthma / Q000453:epidemiology*; D001991:Bronchitis / Q000453:epidemiology*; D016021:Epidemiologic Studies; D006801:Humans; D009275:Names; D011656:Pulmonary Emphysema / Q000453:epidemiology*
ASTHMA/epidemiology; BRONCHITIS/epidemiology; PULMONARY EMPHYSEMA/epidemiology