1. Department of Orthopedic Surgery, Adult Reconstruction and Joint Replacement, Hospital for Special Surgery, New York, United States
2. Department of Orthopedics and Trauma Surgery, General Hospital of the City of Vienna - Hospital of the Medical University of Vienna, Wien, Österreich
3. Department of Orthopaedics, Orthopädische Klinik König-Ludwig-Haus, Würzburg, Deutschland
4. Department of Orthopedics, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Deutschland