Stær-Jensen J1, Richter F2, Hilde G3, Brækken I H4, Bø K3, Engh M E5
1. Akershus University Hospital, Department of Obstetrics and Gynaecology, Lørenskog, Norway, 2. Faculty Division Akershus University Hospital, University of Oslo, Oslo, Norway; Faculty Division Akershus University Hospital, University of Oslo, Norway, 3. Norwegian School of Sports Sciences, Department of Sports Medicine, Oslo, Norway; Akershus University Hospital, Department of Obstetrics and Gynaecology, Lørenskog, Norway, 4. Norwegian School of Sports Sciences, Department of Sports Medicine, Oslo, Norway, 5. Akershus University Hospital, Department of Obstetrics and Gynaecology, Lørenskog, Norway; Faculty Division Akershus University Hospital, University of Oslo, Norway