| Affiliation: | 1. Division of Obstetrics and Gynaecology, Department of Clinical Science and Education, Karolinska Institutet, S?dersjukhuset, Stockholm, Sweden;2. Division of Obstetrics and Gynecology, Department of Clinical Science, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden;3. Unit of Obstetrics and Gynecology, CLINTEC, Karolinska University Hospital at Huddinge, Karolinska Institutet, Stockholm, Sweden;4. Department of Obstetrics and Gynecology, Roskilde University Hospital, Roskilde, Denmark;5. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden |
