1 Department of Orthopedic Surgery, Academic Medical Center, University of Amsterdam, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. g.m.kerkhoffs@amc.uva.nl.
2 Academic Center for Evidence Based Sports Medicine (ACES), Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. g.m.kerkhoffs@amc.uva.nl.
3 Amsterdam Collaboration for Health and Safety in Sports (ACHSS), AMC/VUmc IOC Research Center, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands. g.m.kerkhoffs@amc.uva.nl.
4 Hospital for Special Surgery, New York, NY, USA.
5 Weil Cornell University, New York, NY, USA.
6 Fortius Clinic, London, UK.
7 Imperial College, London, UK.
8 Department of Orthopaedics, Sahlgrenska University Hospital, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden.