1. Department of Orthopaedics, University Clinic Aachen, RWTH Aachen University Clinic, Pauwellstr. 31, 52074 Aachen, Germany
2. Department of Medicine, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi SA, Italy
3. School of Pharmacy and Bioengineering, Keele University School of Medicine, Thornburrow Drive, ST4 7QB Stoke on Trent, UK
4. Queen Mary University of London, Barts and the London School of Medicine and Dentistry, Centre for Sports and Exercise Medicine, Mile End Hospital, 275 Bancro Road, London E1 4DG, UK
5. Department of Orthopedics and Trauma Surgery, Lucerne Cantonal Hospital, Spitalstrasse 16, 6000 Lucerne, Switzerland