1. From the Departments of Psychiatry (W.K.T., S.S.M.C., G.S.U., H.F.K.C.), Medicine and Geriatrics (L.K.S.W., T.C.Y.K., V.M.), and Diagnostic Radiology and Organ Imaging (K.T.W., P.S.R., A.T.A.), Chinese University of Hong Kong; and China Jockey Club Centre for Positive Ageing (H.F.K.C.), Hong Kong SAR, China.