1. From the Department of Medicine and Therapeutics (K.S.W., P.C., M.Q.), the Department of Pediatrics (C.W.Y., R.Y.T.S., S.S.F.L.), the Department of Chemical Pathology (C.W.K.L.), and the Department of Diagnostic Radiology and Organ Imaging (C.M.), Prince of Wales Hospital, The Chinese University of Hong Kong; and the Department of Medicine (D.S.C.), The Royal Prince Alfred Hospital, University of Sydney, Sydney, Australia.