Ma Ronald C, Cheng Angela Y, So Wing Yee, Hui David S, Tong Peter C, Chow Chun Chung
Department of Medicine and Therapeutics, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
Am J Med. 2005 Aug;118(8):927-8. doi: 10.1016/j.amjmed.2005.03.038.