1. Department of Orthopaedic Surgery and Traumatology, Inselspital; University of Bern; Freiburgstrasse, CH-3010 Bern Switzerland
2. Musculoskeletal Research Unit; University of Zurich; Zurich Switzerland
3. Competence Center for Applied Biotechnology and Molecular Medicine (CABMM); Vetsuisse Faculty, University of Zurich; Zurich Switzerland
4. Andrews Sports Medicine and Orthopaedic Center; American Sports Medicine Institute; Birmingham Alabama