1. The Guangxi Colleges and Universities Key Laboratory of Prevention and Control of Highly Prevalent Diseases, School of Public Health, Guangxi Medical University, Nanning, Guangxi Province, China
2. Department of Occupational Health and Occupational Medicine, School of Public Health, Guangxi Medical University, Nanning, Guangxi Province, China
3. Department of Toxicology, School of Public Health, Guangxi Medical University, Nanning, Guangxi Province, China
4. Department of Epidemiology and Health Statistics, School of Public Health, Guangxi Medical University, Nanning, Guangxi Province, China
5. Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore