[1] Sichuan Univ, Dept Rheumatol & Immunol, West China Hosp, Chengdu, Sichuan, Peoples R China
[2] Univ Michigan, Dept Internal Med, Div Rheumatol, Ann Arbor, MI 48109 USA
[3] Univ Michigan, Dept Internal Med, Autoimmun Ctr Excellence, Ann Arbor, MI 48109 USA
[4] VA Ann Arbor Hlth Care Syst, VA Ctr Clin Management Res, Ann Arbor, MI USA
[5] Michigan Med, Dept Internal Med, Div Rheumatol, Ann Arbor, MI USA
[6] Michigan Med, Inst Healthcare Policy & Innovat, Ann Arbor, MI USA
[7] China Med Univ, Dept Rheumatol & Immunol, Shengjing Hosp, Shenyang, Liaoning, Peoples R China