K F Chung1, W F Yeung2, S P Zhang3, Z J Zhang2, M T Wong4, W K Lee5, K W Chan6. 1. Department of Psychiatry, University of Hong Kong. 2. School of Chinese Medicine, University of Hong Kong. 3. School of Chinese Medicine, Hong Kong Baptist University. 4. Department of Psychiatry, Kowloon Hospital. 5. Department of Psychiatry, Kwai Chung Hospital. 6. Department of Psychiatry, United Christian Hospital.