1. Department of Orthopaedic and Trauma Surgery, Campus Bio-Medico University of Rome, Via Alvaro del Portillo, 21, 00128 Roma, Lazio, Italy
2. Department of Musculoskeletal Disorders, Faculty of Medicine and Surgery, University of Salerno, Via Salvator Allende, 84081 Baronissi, Salerno, Italy
3. Centre for Sports and Exercise Medicine, Barts and The London School of Medicine and Dentistry, Mile End Hospital, 275 Bancroft Road, London E1 4DG, England