From the Centre for Clinical Epidemiology and Community Studies and Jewish General Hospital, McGill University Health Centre and McGill University, and Centre Hospitalier de l'Universit de Montral and Universit de Montral, Montreal, Quebec, Canada; Henderson Research Centre and McMaster University Medical Center, McMaster University, Hamilton, Ontario, Canada; Centre Hospitalier Pierre-Boucher, Longueuil, Quebec, Canada; Universit Laval, Quebec City, Quebec, Canada;(2008-11-18時点)