1. Department of Medical Biochemistry, St. Olav Hospital, Trondheim, Norway;
2. Institute of Basic Medical Sciences, Department of Nutrition, University of Oslo, Oslo, Norway;
3. Department of Laboratory Medicine, Children’s and Women’s Health, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway;
4. HUNT Research Centre, Department of Public Health and General Practice, Faculty of Medicine, Norwegian University of Science and Technology, Trondheim, Norway