1. Department of Laboratory Medicine, Children's and Women's Health; Norwegian University of Science and Technology; Trondheim Norway
2. Department of Obstetrics and Gynecology; Trondheim University Hospital; Trondheim Norway
3. Department of Public Health and General Practice; Norwegian University of Science and Technology; Trondheim Norway
4. Clinical Service; Trondheim University Hospital; Trondheim Norway
5. National Center for Fetal Medicine; Trondheim University Hospital; Trondheim Norway