1. Department of Orthopaedic , Trauma, and Reconstructive Surgery, RWTH Aachen University Hospital, Aachen 52064, Germany
2. Department of Orthopaedics , Surgery and Dentistry, University of Salerno, Via S. Allende, Baronissi, Salerno (SA) 84081, 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 E1 4DG, UK
4. School of Pharmacy and Bioengineering , Keele University Faculty of Medicine, Thornburrow Drive, 01782 Stoke on Trent, UK