1 Centre for Biomedical Ethics and Law, Department of Public Health and Primary Care, Faculty of Medicine, KU Leuven, Leuven, Belgium.
2 Department of Sport and Social Sciences, Norwegian School of Sport Sciences, Oslo, Norway.
3 Department of Public Health and Primary Care, Centre for Biomedical Ethics and Law, Faculty of Movement and Rehabilitation Sciences, KU Leuven, Leuven, Belgium.