1. Department of Nursing, Health and laboratory science, Faculty of Health, Welfare and Organization Østfold University College Fredrikstad Norway
2. Faculty of Health Sciences, Department of Psychology UiT—The Arctic University of Norway Tromsø Norway
3. Department of Psychological Medicine Institute of Psychiatry, Psychology and Neuroscience, King's College London London UK
4. Section of Eating Disorders, Department of Psychological Medicine King's College London London UK
5. Institute of Sport Medicine Norwegian School of Sport Sciences Oslo Norway