1. Institute of Mental Health, Southern Medical University; Guangzhou 510515 China
2. Key Laboratory of Psychiatric Disorders of Guangdong Province; China Guangzhou 510515
3. Department of Psychiatry; McGill University, McGill Group for Suicide Studies, Douglas Mental Health University Institute, 6875 LaSalle Blvd; Verdun (Québec) Canada
4. School of Traditional Chinese Medicine; Southern Medical University; Guangzhou 510515 China