[1] Harvard Univ, Sch Publ Hlth, Brigham & Womens Hosp, Boston, MA 02115 USA
[2] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Rheumatol Immunol & Allergy, Boston, MA 02115 USA
[3] Childrens Hosp Boston, Boston, MA USA
[4] Brigham & Womens Hosp, Div Pharmacoepidemiol & Pharmacoecon, Boston, MA 02115 USA
[5] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Rheumatol,Div Pharmacoepidemiol, Boston, MA 02115 USA
[6] Brigham & Womens Hosp, Boston, MA 02115 USA
[7] Stanford Univ, Sch Med, Stanford, CA 94305 USA
[8] Harvard Univ, Brigham & Womens Hosp, Sch Med, Boston, MA 02115 USA