1. Department of Medicine (L.G., M.L. M.-C.B., J.-L.A. P.P., M.-F.H.), Université de Sherbrooke, Québec, Canada J1H 5N4
2. Centre de Recherché Clinique Étienne-Le Bel of the Centre Hospitalier Universitaire de Sherbrooke (M.D., J.Mo., J.Mé., J.-L.A., M.-F.H.), Sherbrooke, Québec, Canada J1H 5N4
3. Department of Population Medicine (M.-F.H.), Harvard Pilgrim Health Care Institute, Harvard Medical School, Boston, Massachusetts 02215
4. Massachusetts General Hospital (M.-F.H.), Boston, Massachusetts 02114