1. Department of Medicine (M.M.E., K.L., E.S.H.), Haukeland University Hospital, N-5021 Bergen, Norway
2. Institute of Medicine (K.L., A.B.W., E.S.H.), University of Bergen, N-5007 Bergen, Norway
3. Department of Medical Genetics (B.S., D.E.U.), Oslo University Hospital, Ullevål, N-0407 Oslo, Norway
4. Institute of Medical Genetics (B.S., D.E.U.), University of Oslo, N-0315 Oslo, Norway
5. Department of Medicine (J.S.), University Hospital of North Norway, N-9038 Tromsø, Norway
6. Institute of Clinical Medicine (J.S.), University of Tromsø, N-9037 Tromsø, Norway
7. Department of Endocrinology (K.J.F.), St. Olavs University Hospital, N-7006 Trondheim, Norway
8. Department of Endocrinology (T.J.B.), Oslo University Hospital, Aker, N-0514 Oslo, Norway
9. Department of Endocrinology (J.B.), Oslo University Hospital, Rikshospitalet, N-0027 Oslo, Norway
10. Section of Endocrinology (J.B.) University of Oslo, N-0027 Oslo, Norway
11. Østfold Hospital (B.M.), N-1606 Fredrikstad, Norway
12. Clinical Chemistry (J.A.C.), University Hospital, S-205 05 Malmö, Sweden
13. Roche Molecular Systems (H.E.), Alameda, California 94501