1. Department of Cardiology; Roskilde Hospital; Roskilde Denmark
2. Department of Cardiology; Gentofte University Hospital; Hellerup Denmark
3. Copenhagen Centre for Team Sport and Health, Department of Nutrition, Exercise and Sports, Section of Human Physiology; University of Copenhagen; Copenhagen Denmark
4. FIFA Medical Assessment and Research Centre (F-MARC) and Schulthess Klinik; Zürich Switzerland
5. Aalborg University; Aalborg Denmark
6. Sport and Health Sciences; College of Life and Environmental Sciences; St Luke's Campus; University of Exeter; Exeter UK