1. Department of Clinical Sciences and Education, Karolinska Institutet, Södersjukhuset, Sweden
2. Department of Obstetrics and Gynaecology, Södersjukhuset, Stockholm, Sweden
3. Division of Internal Medicine, Department of Clinical Sciences, Karolinska Institutet, Danderyd Hospital, Stockholm, Sweden
4. Department of Obstetrics and Gynaecology, Sahlgrenska University Hospital, Gothenburg, Sweden
5. Department of Obstetrics and Gynecology, The Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden