1. Department of Orthopaedic and Trauma Surgery, Campus Bio-Medico University, Via Alvaro del Portillo, 200, 00128 Trigoria, Rome, Italy
2. Department of Musculoskeletal Disorders, University of Salerno School of Medicine and Surgery, Via Giovanni Paolo II, 132 - 84084 Fisciano, 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
4. Knee Surgery and Sports Traumatology Unit, Humanitas Research Hospital, Via Manzoni 56, 20089 Rozzano, Milan, Italy