[1] Univ Oklahoma, Hlth Sci Ctr, Rheumatol, Oklahoma City, OK USA
[2] Univ Oklahoma, Hlth Sci Ctr, Dept Med, Oklahoma City, OK USA
[3] Oklahoma Med Res Fdn, Arthrit & Clin Immunol Res Program, 825 NE 13th St, Oklahoma City, OK 73104 USA
[4] Univ Oklahoma, Hlth Sci Ctr, Med Rheumatol, Oklahoma City, OK USA
[5] Univ Michigan, Div Rheumatol, Ann Arbor, MI 48109 USA