[1] Univ Arkansas Med Sci, Little Rock, AR 72205 USA
[2] NYU, Hosp Joint Dis, New York, NY USA
[3] Univ Paris 05, Paris, France
[4] Univ Copenhagen Hosp, Herlev, Denmark
[5] Univ Tartu, EE-50090 Tartu, Estonia
[6] Natl Univ Athens, Athens, Greece
[7] Cent Hosp, Aanekoski, Finland
[8] Sint Franciscus Gasthuis Hosp, Rotterdam, Netherlands
[9] Mil Inst Med, Warsaw, Poland