1. Adult Reconstruction and Joint Replacement Department, Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA
2. Department of Orthopedic Surgery, University of Ulm, Oberer Eselsberg 45, 89081 Ulm, Germany
3. The Complex Joint Reconstruction Centre at Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021, USA
4. Department of Orthopedics (Friedrichsheim), University Hospital Frankfurt, Goethe University, 60590 Frankfurt am Main, Germany
5. Department of Orthopedics, University of Wuerzburg, Brettreichstrasse 11, 97074 Wuerzburg, Germany
6. Department of Orthopedics, Evangelisches Krankenhaus, Hans-Sachs Gasse 10-12, 1180 Vienna, Austria