Acknowledgement
The authors gratefully acknowledge Professor Qin Liu, associate professor from the School of Public Health and Management, Chongqing Medical University, for making helpful suggestions about this paper. This study was supported by the Program for Innovation Team Building at Institutions of Higher Education in Chongqing in 2016 (grant no. CXTDG201602006) and the Natural Science Foundation of Chongqing (2015msxm055).
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