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1. Division of Surgery and Urology, Department of Clinical Sciences, Karolinska Institutet Danderyd Hospital, Stockholm, Sweden, 2. Division of Obstetrics and Gynecology, Department of Clinical Sciences, Karolinska Institutet Danderyd Hospital, Stockholm, Sweden, 3. Department of Obstetrics and Gynecology, Västerås Hospital, Västerås, Sweden, 4. Department of Obstetrics and Gynecology, South Hospital, Stockholm, Sweden, 5. Division of Obstetrics and Gynecology, Department of Clinical Sciences, Karolinska Institutet Danderyd Hospital and Department of Medical Epidemiology and Biostatistics, Karolinska Institute, Stockholm, Sweden
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