1. Tromsø Endocrine Research Group, Department of Clinical Medicine, University of Tromsø, Tromsø, Norway
2. Division of Internal Medicine, University Hospital of North Norway, Tromsø, Norway
3. Department of Medical Biology, University of Tromsø, Tromsø, Norway
4. Department of Medical Biochemistry, University Hospital of North Norway, Tromsø, Norway
5. Hormone Laboratory, Haukeland University Hospital, Bergen, Norway