1. From the Department of Epidemiology and Public Health (H.N., A.S.-M., M.S., D.G., M.G.M., M.K.), University College London, United Kingdom; INSERM U687-IFR69 (H.N., A.S.-M.), Hôpital Paul Brousse, Villejuif Cedex, France; Hôpital Ste Périne (A.S.-M.), Centre de Gérontologie, Paris, France; Finnish Institute of Occupational Health (M.K.), Helsinki, Finland.