1. Department of Epidemiology and Biostatistics, School of Public Health Anhui Medical University Hefei Anhui PR China
2. Anhui Province Key Laboratory of Major Autoimmune Diseases Anhui Medical University Hefei Anhui PR China
3. Liuzhou Center for Disease Control and Prevention Liuzhou Guangxi Zhuang Autonomous Region PR China
4. Hefei Center for Disease Control and Prevention Hefei Anhui PR China