1. From the Departments of Medicine and Therapeutics (A.Y-M.W., M.W., Y.Z., J.E.S.) and Chemical Pathology (C.W-K.L., I.H-S.C.), Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong. Current affiliations: Department of Medicine (A.Y-M.W., M.W.), Queen Mary Hospital, University of Hong Kong, Hong Kong; Department of Cardiovascular Medicine (J.E.S.), University of Birmingham, Edgbaston, Birmingham, United Kingdom.