1. Department of Orthopaedic Surgery, RWTH Aachen University Clinic, Aachen, Germany
2. Department of Medicine, Surgery and Dentistry, University of Salerno, Baronissi, Italy
3. School of Pharmacy and Bioengineering, Keele University School of Medicine, Stoke on Trent, UK
4. Centre for Sports and Exercise Medicine, Mile End Hospital, Queen Mary University of London, Barts and the London School of Medicine and Dentistry, London, UK