1 Institute of Mental Health, National Clinical Research Center for Mental Disorders, Key Laboratory of Mental Health and Peking University Sixth Hospital, Peking University, Beijing 100191, China.
2 National Institute on Drug Dependence, Peking University, Beijing 100191, China.
3 Department of Psychiatry, First Hospital of Hebei Medical University, Shijiazhuang 050031, China.
4 Department of Psychiatry and Behavioral Sciences, University of Washington, P.O. Box 356560, Seattle, WA 98195-6560, USA.
5 Institute of Mental Health, National Clinical Research Center for Mental Disorders, Key Laboratory of Mental Health and Peking University Sixth Hospital, Peking University, Beijing 100191, China; National Institute on Drug Dependence, Peking University, Beijing 100191, China. Electronic address: linlu@bjmu.edu.cn.