1. Department of Rheumatology and Immunology, the First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China;
2. Wuxi Center for Disease Control and Prevention, Wuxi, Jiangsu, China;
3. Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui, China;
4. Wuxi Emergency Medical Centre, Wuxi, Jiangsu, China