[1] Univ Penn, Perelman Sch Med, Dept Med, Philadelphia, PA 19104 USA
[2] Univ Penn, Perelman Sch Med, Dept Epidemiol, Philadelphia, PA 19104 USA
[3] Corrona LLC, Waltham, MA USA
[4] Univ Massachusetts, Sch Med, Dept Med, Worcester, MA USA
[5] Amgen Inc, Global Med Affairs, Thousand Oaks, CA 91320 USA
[6] Univ Washington, Sch Med, Div Rheumatol Clin Res, Swedish Med Ctr,Providence St Joseph Hlth, Seattle, WA USA
[7] Univ Washington, Sch Med, Div Rheumatol, Seattle, WA USA