1. Department of Public Health, Chengdu Medical College, Sichuan, P.R. China
2. Department of psychosomatic medicine, Chengdu Fifth People’s Hospital/Geriatric Diseases Institute of Chengdu, Sichuan, P.R. China
3. Art College, Southwest Minzu University, Sichuan, P.R. China
4. Department of Neuroscience, Beijing Institute of Basic Medical Sciences, Beijing, P.R. China