The significance of the relative reduction of FVC and FEV1 after methacholine challenge.
D001985:Bronchial Provocation Tests; D006801:Humans; D008297:Male; D016210:Methacholine Chloride; D008688:Methacholine Compounds; D008875:Middle Aged; D012907:Smoking
D008688:Methacholine Compounds; D016210:Methacholine Chloride