1. From the Departments of Medicine (D.R.A.), Surgery (M.D.), and Community Health and Epidemiology (P.A.), Dalhousie University, and the Nova Scotia Health Authority (S. Pleasance, S. Doucette, C.T., A.A.), Halifax, the Department of Surgery, University of Toronto, Toronto (J.M.), the Departments of Medicine (S.R.K.) and Surgery (W.F., D.Z.), McGill University, and the Department of Surgery, University of Montreal (P.-A.V.), Montreal, the Department of Medicine, McMaster University, Hamilton, ON (P.G., M....