1. From the Department of Medicine and Geriatrics, Shatin Hospital, Hong Kong (F.K.S., K.K.H.O.); Center for Clinical Trials and Epidemiological Research (E.W.) and Department of Medicine and Therapeutics, Prince of Wales Hospital (J.W.), Chinese University of Hong Kong; and Division of Clinical Care Research, Tufts New England Medical Center, Boston, Mass (J.L.).