[1] Columbia Univ, Div Rheumatol, Irving Med Ctr, New York, NY 10032 USA
[2] Columbia Univ, Vagelos Coll Phys & Surg, New York, NY USA
[3] Univ Calif San Francisco, Lupus Clin, San Francisco, CA USA
[4] Feinstein Inst Med Res, Manhasset, NY USA
[5] Univ Calif San Francisco, Rheumatol Clin Res Ctr, San Francisco, CA USA