1. University of Heidelberg, Clinic for Orthopaedic and Trauma Surgery, Schlierbacher Landstrasse 200 A, 69118 Heidelberg, Germany.
2. University of Heidelberg, Department of Medical Biometry and Informatics, Im Neuenheimer Feld 305, 69120 Heidelberg, Germany.
3. University of Heidelberg, BIOQUANT, IPMB, and DKFZ Heidelberg, Department of Bioinformatics and Functional Genomics, Biomedical Computer Vision Group 69120 Heidelberg, Germany.
4. University of Giessen, Clinic of Orthopaedics and Orthopaedic Surgery, Paul Meimberg Strasse 3, 35392 Giessen, Germany.
5. University of Dresden, Department of Orthopaedic Surgery, Fetscherstrasse 74, 01307 Dresden, Germany.