1 Sports Groin Pain Centre, Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
2 Amsterdam UMC location University of Amsterdam, Academic Center for Evidence Based Medicine, Amsterdam IOC Center ACHSS. Meibergdreef 9, Amsterdam, The Netherlands.
3 Amsterdam Movement Sciences, Sports, Amsterdam, The Netherlands.
4 Department of Orthopaedics and Sports Medicine, Erasmus MC University Medical Centre, Rotterdam, The Netherlands.