1. Department of Orthopaedic and Trauma Surgery, Campus Bio-Medico University, Via Alvaro del Portillo, 200, 00128 Trigoria, Rome, Italy
2. Department of Musculoskeletal Disorder, Faculty of Medicine and Surgery, University of Salerno, Salerno 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, England
4. Institute of Science and Technology in Medicine, Keele University School of Medicine, Thornburrow Drive, Stoke on Trent, England