1. From the Leducq Center for Molecular and Genetic Epidemiology of Cardiovascular Disorders (P.M.R.), the Center for Cardiovascular Prevention (P.M.R.), Division of Cardiovascular Diseases (P.M.R., M.P., F.S., E.B.) and the Division of Preventive Medicine (P.M.R.), Brigham and Women’s Hospital; the Department of Pathology, Children’s Hospital Medical Center (N.R.), Harvard Medical School, Boston, Mass; and the Centre Universitaire de Sante de l’Estrie (S.L.), Sherbrooke, Quebec, Canada.