Ching-Wen Chu1, Chih-Sung Liang2,3. 1. Department of Psychiatry, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan. 2. Department of Psychiatry, Beitou Branch, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan. 3. Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan.