Nicola Maffulli1,2, F Alan Barber3. 1. Department of Musculoskeletal Disorders, University of Salerno School of Medicine and Dentistry, Salerno, Italy. 2. Queen Mary University of London, Barts and the London School of Medicine and Dentistry, Centre for Sports and Exercise Medicine, Mile End Hospital, London, UK. 3. Plano Orthopedic Sports Medicine Center, Plano, TX.