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1. Akershus University Hospital. Department of Obstetrics and Gynaecology, Lørenskog, Norway, 2. Norwegian School of Sport Sciences, Department of Sports Medicine, Oslo, Norway, 3. Norwegian School of Sport Sciences, Department of Sports Medicine, Oslo, Norway, Akershus University Hospital. Department of Obstetrics and Gynaecology, Lørenskog, Norway, 4. HØKH, Research Centre, Akershus University Hospital, Lørenskog, and Faculty Division Akershus University hospital, University of Oslo, Oslo, Norway, 5. Akershus University Hospital. Department of Obstetrics and Gynaecology, Lørenskog, Norway, Faculty Division Akershus University, University of Oslo, Oslo, Norway
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