Acknowledgments
Here, we would like to thank Xinyu Zhou and his colleagues, professors in Psychiatry, for their advice on the questionnaire design and analysis. We also want to thank Professor Xiaoni Zhong, from the School of Public Health and Management in Chongqing Medical University, for her indispensable contributions to the statistical design and analysis. We would like to thank Dr. Kim C. Liu from University of Cambridge for his proof-reading and comments on the manuscript.