[1] Harvard Univ, Brigham & Womens Hosp, Sch Med, Div Pharmacoepidemiol & Pharmacoecon, Boston, MA 02115 USA
[2] Harvard Univ, Brigham & Womens Hosp, Sch Med,Div Rheumatol Immunol & Allergy, Robert B Brigham Multipurpose Arthrit & Musculosk, Boston, MA 02115 USA
[3] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Med,Div Gen Med, Boston, MA 02115 USA
[4] Harvard Univ, Brigham & Womens Hosp, Sch Med, Dept Orthoped Surg, Boston, MA 02115 USA