1. From the Department of Public Health and Clinical Medicine and Department of Medicine (J.P., K.A., B.C., P.-G.W.), Department of Community Medicine and Rehabilitation, Geriatric Medicine, Sunderby Research Unit (A.W.), and Department of Statistics, Umeå School of Business and Economics (M.E.), Umeå University, Sweden; and Department of Medical Sciences, Uppsala University, Sweden (S.Å.).