1. Center of Obstetrics and Gynecology, Umeå University Hospital, 901 85 Umeå, Sweden
2. Department of Clinical Sciences, Obstetrics and Gynecology, Umeå University, 901 85 Umeå, Sweden
3. Department of Radiation Sciences, Oncology, Umeå University, 901 85 Umeå, Sweden
4. Department of Radiation Sciences, Diagnostic Radiology, Umeå University, 901 85 Umeå, Sweden