1 Department of Orthopedics and Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, Iowa.
2 Department of Orthopaedic Surgery (A.J.S.) and Divisions of Pharmacoepidemiology and Pharmacoeconomics and Rheumatology, Inflammation, and Immunity (S.C.K.), Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.