1. Department of Orthopaedic Surgery, Stanford University School of Medicine, Redwood City, CA 94063, USA
2. Südtiroler Sanitätsbetrieb, 39042 Brixen, Italy
3. Orthoapedic Sports Medicine, University of Toronto, Toronto, ON M5S 1B2, Canada
4. Institute for Biomechanics, Paracelsus Medical University, Strubergasse 21, 5020 Salzburg, Austria
5. School of Medicine, University of Genova, 16132 Genova, Italy
6. Department of Orthopaedic and Trauma Surgery, San Paolo Hospital, 00053 Civitavecchia, Italy