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1. Department of Clinical Science and Education, Södersjukhuset, 2. Division of Obstetrics and Gynecology, Department of Clinical Science, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden, and Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden,, 3. Department of Clinical Sciences, Karolinska Institutet Danderyd Hospital, Stockholm, Sweden, 4. Department of Obstetrics and Gynecology, Sahlgrenska University Hospital, 5. Division of Obstetrics and Gynecology, Department of Clinical Science, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden, 6. Unit of Obstetrics and Gynecology, CLINTEC, Karolinska University Hospital at Huddinge, Karolinska Institutet, Stockholm, Sweden,
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