title: Can database studies be used to make the tough research decisions?
authors.affiliation: 1 Family Physician Airways Group of Canada University of Toronto Toronto, Ontario, Canada.
authors.forename: Alan
authors.initials: A
authors.lastname: Kaplan
authors.forename: Rupert
authors.initials: R
authors.lastname: Jones
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis*