1. Department of Musculoskeletal Disorders, Faculty of Medicine and Surgery, University of Salerno, Baronissi, Italy
2. Clinica Ortopedica, Ospedale San Giovanni di Dio e Ruggi D'Aragona, Salerno, Italy
3. Centre for Sports and Exercise Medicine, Barts and The London School of Medicine and Dentistry, Mile End Hospital, London, Queen Mary University of London, London, England
4. Keele University, School of Medicine, Institute of Science and Technology in Medicine, Guy Hilton Research Centre, Hartshill, Stoke-on-Trent, England