1. From the Department of Medicine (G.D.O.L., A.R., C.R.), University of Glasgow, Scotland; the Department of Epidemiology and Public Health (P.M.S., D.B.), University of Wales College of Medicine, UK; the Department of Epidemiology and Public Health (J.W.G.Y.), Queen’s University, Belfast, Ireland; and the Department of Public Health (Y.B.-S.), University of Bristol, UK.