1. Department of Rheumatology and Immunology, Sichuan University West China Hospital, Chengdu, China.
2. Department of Nephrology, Fourth People's Hospital of Sichuan Province, Chengdu, China.
3. Division of Rheumatology, Clinical Autoimmunity Center of Excellence, University of Michigan Medical School, Ann Arbor, MI, USA.
4. Department of Rheumatology and Immunology, Sichuan University West China Hospital, Chengdu, China. chenyanglu1991@hotmail.com