title: Confounding issues in COPD risk study?
authors.forename: Ranjeeta
authors.initials: R
authors.lastname: Sinvhal
authors.forename: Lorraine
authors.initials: L
authors.lastname: Tosiello
authors.forename: Greg
authors.initials: G
authors.lastname: Cable
mesh_terms: D015992:Body Mass Index; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis*; D012307:Risk Factors