1. Department of Obstetrics and Gynecology Stockholm South General Hospital Södersjukhuset Stockholm Sweden
2. Department of Clinical Science and Education Stockholm South General Hospital Södersjukhuset, Karolinska Institutet Stockholm Sweden
3. Department of Obstetrics and Gynecology, Institute of Clinical Sciences, Sahlgrenska Academy Gothenburg University, Sahlgrenska University Hospital Gothenburg Sweden
4. Department of Obstetrics and Gynecology Vrinnevi Hospital Norrköping Sweden
5. Department of Obstetrics and Gynecology and Department of Biomedical and Clinical Sciences Linköping University Linköping Sweden
6. Department of Obstetrics and Gynecology Danderyd Hospital Stockholm Sweden
7. Department of Clinical Sciences, Karolinska Institutet Danderyd Hospital Stockholm Sweden