1. From the Department of Epidemiology and Biostatistics (M. Bochud, R.C.E.), Case Western Reserve University, Cleveland, Ohio; Institut Universitaire de Médecine Sociale et Préventive (M. Bochud, P.B., F.P.), Lausanne, Switzerland; Département de Médecine et Service de Néphrologie (J.N., M.R.M., M. Burnier), Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland; and the Ministry of Health (P.B., C.S.), Victoria, Seychelles.