1. Department of Orthopaedics and Trauma Surgery, University Clinic Aachen, RWTH Aachen University Clinic, Aachen, Germany
2. Department of Medicine, Surgery and Dentistry, University of Salerno, Allende, Baronissi (SA), Italy
3. School of Pharmacy and Bioengineering, Keele University School of Medicine, Thornburrow Drive, Stoke on Trent, UK
4. Queen Mary University of London, Barts and the London School of Medicine and Dentistry, Centre for Sports and Exercise Medicine, London, UK
5. University of Toronto Orthopaedic Sports Medicine Program (UTOSM), Women´s College Hospital, Toronto, ON, Canada
6. Department of Spine Surgery, Eifelklinik St., Brigida, Simmerath, Germany