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1. Dept. of obstetrics and gynecology, Roskilde University Hospital, Denmark, 2. dept. of obstetrics and gynecology, University Hospital Lund, Sverige, 3. Dept of Obstetrics and Gynecology, Turku University Hospital, Finland, 4. Dept of Obstetrics and Gynecology, Hospital in Lidkoping, Sverige, 5. Dept of Obstetrics and Gynecology, Ahus University Hospital,Norge, 6. Dept of Obstetrics and Gynecology, Ahus University Hospital, Norge
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