1. Department of Public Health; Norwegian University of Science and Technology; Trondheim Norway
2. Department of Gynecology and Obstetrics; Levanger Hospital, Nord-Trøndelag Hospital Trust; Norway
3. Department of Oncology; St. Olavs Hospital, Trondheim University Hospital; Trondheim Norway
4. Department of Laboratory Medicine, Children's and Women's Health; Norwegian University of Science and Technology; Trondheim Norway
5. Cancer Registry of Norway; Institute of Population-Based Cancer Research; Oslo Norway
6. Department of Endocrinology, St. Olavs Hospital; Trondheim University Hospital; Trondheim Norway