title: Methacholine challenge. PD20 versus PC20.
authors.affiliation: Department of Medicine, Division of Respirology, Critical Care and Sleep Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
authors.forename: Donald W
authors.initials: DW
authors.lastname: Cockcroft
mesh_terms: D001249:Asthma / Q000175:diagnosis*; D016535:Bronchial Hyperreactivity / Q000175:diagnosis*; D005260:Female; D005541:Forced Expiratory Volume / Q000187:drug effects*; D006801:Humans; D008297:Male; D016210:Methacholine Chloride / Q000008:administration & dosage*
chemical_list: D016210:Methacholine Chloride