1. Research Institute for Internal Medicine (S.L.F., T.L.), Oslo University Hospital, Rikshospitalet, N-0027 Oslo, Norway
2. Section of Endocrinology (S.L.F., T.L., J.B.), Oslo University Hospital, Rikshospitalet, N-0027 Oslo, Norway
3. Faculty of Medicine (O.C.B., J.B., J.P.B.), University of Oslo, Oslo University Hospital, Rikshospitalet, N-0027 Oslo, Norway
4. Division of Pathology (O.C.B.), Oslo University Hospital, Rikshospitalet, N-0027 Oslo, Norway
5. Department of Laboratory Medicine/Pathology (O.C.B.), Umeå University Hospital, SE-901 87 Umeå, Sweden
6. Department of Radiology (J.K.H.), Oslo University Hospital, Rikshospitalet, N-0027 Oslo, Norway
7. Department of Medical Biochemistry and Clinical Pharmacology (J.P.B.), Oslo University Hospital, Ullevål, N-0407 Oslo, Norway