1 Department of Rheumatology & Immunology, West China Hospital, Sichuan University, Chengdu, China.
2 Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN, USA.
3 Department of Rheumatology, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China.