1. Department of Orthopedics and Trauma Surgery, RWTH Aachen University Clinic, 52064 Aachen, Germany
2. Department of Medicine, Surgery and Dentistry, University of Salerno, Via S. Allende, 84081 Baronissi SA, Italy
3. Queen Mary University of London, Barts and the London School of Medicine and Dentistry, Centre for Sports and Exercise Medicine, Mile End Hospital, 275 Bancroft Road, London E1 4DG, UK
4. School of Pharmacy and Bioengineering, Keele University Faculty of Medicine, Thornburrow Drive, ST4 7QB Stoke on Trent, UK
5. Department of Orthopaedics and Trauma Surgery, University Medical Centre Mannheim of the University Heidelberg, 68167 Mannheim, Germany