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1. Department of Obstetrics and Gynecology, Karolinska Institutet at Danderyd University Hospital, 2. Helsinki University Central Hospital, Department of Obstetrics and Gynecology, Jorvi Hospital, Espoo, Finland, 3. Department of Obstetrics and Gynaecology, Akershus University Hospital, University of Oslo, Lørenskog, Norway, 4. Department of Obstetrics and Gynecology, Aarhus University Hospital, Skejby, Denmark
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