1. Department of Rheumatology and Immunology; Xi'an No. 5 Hospital; 112 XiGuanZhengJie Lian Hu District Xi'an 710082 China
2. Department of Preventive and Health Services; Xi'an No. 5 Hospital; 112 XiGuanZhengJie Lian Hu District Xi'an 710082 China
3. Xi'an Institute of Rheumatology; Xi'an 710082 China