[1] CortoClinics, Schijndel, Netherlands
[2] Univ Autonoma Madrid, Hosp La Paz, Dept Orthopaed Surg & Traumatol, Madrid, Spain
[3] Univ Laval, CHU Quebec, Dept Chirurg Orthoped, Quebec City, PQ, Canada
[4] Univ East Anglia, Norwich Med Sch, Norwich, Norfolk, England
[5] Ctr Res & Documentat Arthroplasty, Lille, France
[6] OA Ctr Orthopaed, Portland, ME USA
[7] Kantonsspital Baselland Bruderholz Liestal Laufen, Dept Orthopaed Surg & Traumatol, CH-4101 Bruderholz, Switzerland
[8] Univ Basel, Basel, Switzerland
[9] Stanford Univ, Sch Med, Dept Orthopaed Surg, Stanford, CA USA
[10] Int Comm Amer Acad Hip & Knee Surg AAHKS, Rosemont, PA USA
[11] Med Univ Innsbruck, Dept Orthopaed Surg, Anichstr 35, A-6020 Innsbruck, Austria
[12] Univ Thessalia, Univ Gen Hosp Larissa, Fac Med, Sch Hlth Sci,Orthopaed Dept, Thessalia, Greece
[13] GZA Hosp, Dept Orthoped Surg & Traumatol, Antwerp, Belgium
[14] Ortoklin & Cankaya Orthoped, Ankara, Turkey
[15] Ist Clin St Ambrogio IRCCS Galeazzi, Orthopaed Dept, Milan, Italy
[16] IRCCS Ist Ortoped Galeazzi, Hip Dept, Milan, Italy