[1] Univ N Carolina, Thurston Arthrit Res Ctr, Dept Med, 3300 Thurston Bldg,CB 7280, Chapel Hill, NC 27599 USA
[2] Dept Vet Affairs Med Ctr, Ctr Hlth Serv Res Primary Care, Durham, NC USA
[3] Dept Orthopaed, Level 2,Clin Sci Bldg,29 Regent St, Fitzroy, Vic 3065, Australia
[4] Univ Melbourne, Level 2,Clin Sci Bldg,29 Regent St, Fitzroy, Vic 3065, Australia
[5] St Vincents Hosp Melbourne, Dept Surg, Level 2,Clin Sci Bldg,29 Regent St, Fitzroy, Vic 3065, Australia
[6] Univ Hlth Network, Krembil Res Inst, Div Hlth Care & Outcomes Res, MP11-322,399 Bathurst St, Toronto, ON M5T 2S8, Canada
[7] Univ Toronto, Inst Hlth Policy Management & Evaluat, MP11-322,399 Bathurst St, Toronto, ON M5T 2S8, Canada
[8] Inst Rehabil Sci, Toronto, ON, Canada
[9] Univ Toronto, Dept Phys Therapy, MP11-322,399 Bathurst St, Toronto, ON M5T 2S8, Canada
[10] Univ Toronto, Dept Surg, MP11-322,399 Bathurst St, Toronto, ON M5T 2S8, Canada
[11] Keele Univ, Arthrit Res UK Primary Care Ctr, Inst Primary Care & Hlth Sci, Keele ST5 5BG, Staffs, England
[12] Univ Calgary, Sport Injury Prevent Res Ctr, Calgary, AB, Canada
[13] Univ Calgary, Cumming Sch Med, Fac Kinesiol, Calgary, AB, Canada
[14] Univ Sydney, Kolling Inst, Inst Bone & Joint Res, Sydney, NSW, Australia
[15] Royal North Shore Hosp, Dept Rheumatol, St Leonards, NSW 2065, Australia
[16] Brigham & Womens Hosp, Dept Orthoped Surg, Orthoped & Arthrit Ctr Outcomes Res, 75 Francis St,BC 4-4016, Boston, MA 02115 USA
[17] Boston Univ, Sch Publ Hlth US, 75 Francis St,BC 4-4016, Boston, MA 02115 USA
[18] Brigham & Womens Hosp, Dept Orthoped Surg, Policy & Innovat EValuat Orthoped Treatment PIVOT, 75 Francis St,BC 4-4016, Boston, MA 02115 USA
[19] Amer Acad Orthopaed Surg, Hlth Care Syst Comm, San Diego Musculoskeletal & Joint Res Fdn, Private Practice, San Diego, CA USA
[20] Univ Southern Denmark, Inst Sports Sci & Clin Biomech, Res Unit Musculoskeletal Funct & Physiotherapy, Campusvej 55, DK-5230 Odense M, Denmark
[21] Aalborg Univ Hosp, Clin Nursing Res Unit, DK-9000 Aalborg, Denmark
[22] Naestved Slagelse Ringsted Hosp, Dept Physiotherapy & Occupat Therapy, DK-4200 Slagelse, Denmark
[23] Univ Gothenburg, Sahlgrenska Acad, Dept Clin Neurosci & Rehabil, Inst Neurosci & Physiol, Gothenburg, Sweden
[24] Ctr Registers Vastra Gotaland, BOA Registry, S-41345 Gothenburg, Sweden
[25] Reade Ctr Rehabil & Rheumatol, Rehabil Res Ctr, Dr J van Breemenstr 2,POB 58271, NL-1056 AB Amsterdam, Netherlands
[26] Univ Alberta, Fac Rehabil Med, Dept Phys Therapy, 2-50 Corbett Hall,8205-114 St, Edmonton, AB T6G 2G4, Canada
[27] Univ Alberta, Glen Sather Sports Med Clin, 2-50 Corbett Hall,8205-114 St, Edmonton, AB T6G 2G4, Canada