[1] Kaiser Permanente, Surg Outcomes & Anal Dept, San Diego, CA 92120 USA
[2] Univ South Australia, Sch Pharm & Med Sci, Med & Devices Surveillance, Ctr Res Excellence,Sansom Inst, Adelaide, SA, Australia
[3] Permanente Med Grp Inc, Dept Orthopaed Surg, Sacramento, CA USA
[4] Deakin Univ, Sch Med, Geelong, Vic, Australia
[5] Barwon Hlth, Barwon Orthopaed Res Unit, Geelong, Vic, Australia
[6] Univ Copenhagen, Herlev Hosp, Dept Orthopaed Surg, Herlev, Denmark
[7] Karolinska Inst, Danderyds Sjukhus AB, Dept Orthoped, Stockholm, Sweden
[8] Univ Adelaide, Sch Populat Hlth, AOA Natl Joint Registry, Data Management & Anal Ctr, Adelaide, SA, Australia
[9] Southern Calif Permanente Med Grp, Dept Orthopaed Surg, Harbor City, CA USA