1. Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui, China
2. Department of Epidemiology, Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, Anhui, China
3. Teaching Center for Preventive Medicine, School of Public Health, Anhui Medical University, Hefei, Anhui, China