Ping Min Chen1, Ping Yu Chen2, Wen Chih Chiang3. 1. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan. 2. Department of Internal Medicine, Chi Mei Medical Center, Chia Li Campus, Tainan, Taiwan. 3. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan. Electronic address: wcchiang@ntu.edu.tw.