Affiliation: | (1) Department of Orthopaedic Surgery and Division of Rheumatology, Brigham and Womens' Hospital, and Department of Epidemiology, Harvard School of Public Health, Boston, USA;(2) Department of Orthopaedic Surgery and Division of Rheumatology, Brigham and Womens' Hospital, Boston, USA;(3) Department of Community and Family Medicine, Dartmouth Medical School, Lebanon, USA;(4) Department of Orthopaedic Surgery and Division of Rheumatology, Brigham and Womens' Hospital and Department of Biostatistics, Boston University School of Public Health, Boston, USA |