[1] Shanxi Med Univ, Hosp 2, Taiyuan, Shanxi, Peoples R China
[2] Shanxi Med Univ, Hosp 2, Rheumatol, Taiyuan, Shanxi, Peoples R China
[3] Shanxi Med Univ, Hosp 2, Rheumatol, Taiyuan, Shanxi, Peoples R China
[4] Harvard Med Sch, Brigham & Womens Hosp, Dept Pathol, Boston, MA USA