1Sports Clinic, Centre Hospitalier de Luxembourg - Clinique d'Eich, 8 rue d'Eich, 1460, Luxembourg, Luxembourg.
2Luxembourg Institute of Research in Orthopaedics, Sports Medicine and Science, Luxembourg, Luxembourg.
3Human Motion, Orthopaedics, Sports Medicine and Digital Methods, Luxembourg Institute of Health, Strassen, Luxembourg.
4VirtaMed AG, Rütistrasse 12, CH-8952, Schlieren, Switzerland.
5Univ Rennes, INSERM, LTSI - UMR 1099, 35000, Rennes, France.
6Orthopädische Gemeinschaftspraxis am OEZ, Hanauer Str. 65, 80993, Munich, Germany.
7Department of Orthopaedics and Traumatology, University of Brandenburg an der Havel, Hochstrasse 29, 14770, Brandenburg/Havel, Germany. roland_becker@yahoo.de.