1. Department of Sports Medicine, Norwegian School of Sports Sciences, PO Box 4014, Ullevål Stadion 0806, Oslo, Norway. She was a Master candidate at the time this manuscript was accepted
2. Department of Sports Medicine, Norwegian School of Sports Sciences, and Department of Obstetrics and Gynaecology, Akershus University Hospital, Lørenskog, Norway
3. Department of Sports Medicine, Norwegian School of Sports Sciences
4. Department of Obstetrics and Gynaecology, Akershus University Hospital, and Faculty of Medicine, University of Oslo, Oslo, Norway
5. Department of Sports Medicine, Norwegian School of Sports Sciences, and Department of Obstetrics and Gynaecology, Akershus University Hospital