1. Department of Orthopaedic Surgery Regensburg University Medical Center Bad Abbach Germany
2. Department of Orthopaedic Surgery, Orthopaedic Surgery, Adult Reconstruction and Joint Replacement Hospital for Special Surgery New York New York USA
3. Faculty of Mechanical Engineering, Laboratory for Biomechanics, Ostbayerische Technische Hochschule Regensburg Germany
4. Department of Orthopaedic and Trauma Surgery Heidelberg University Medical Center Heidelberg Germany