1. Department of Orthopaedic and Trauma Surgery, Campus Bio-Medico University of Rome, Rome, Italy
2. Faculty of Medicine, Surgery and Dentistry, Department of Musculoskeletal Disorders, University of Salerno, Baronissi, 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, England
4. Institute of Science and Technology in Medicine, Department of Orthopaedics, Keele University School of Medicine, Stoke on Trent, England