1. *Department of Rheumatology and Immunology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China;
2. †Department of Rheumatology, The First People’s Hospital of Foshan, Foshan, Guangdong, China; and
3. ‡Department of Rheumatology, Guangdong Provincial People’s Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China