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 Gynaecology, 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.