1 Department of Social Medicine, School of Public Health, Central South University, Changsha 410078, China; Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.
2 Department of Social Medicine, School of Public Health, Central South University, Changsha 410078, China.
3 Mental Health Institute, Second Xiangya Hospital, Central South University, Changsha, China.
4 Department of Social Medicine, School of Public Health, Central South University, Changsha 410078, China. Electronic address: xiaosy@csu.edu.cn.