1. Department of Nephrology (T.I., M.B.J., M.H., B.F.-R.), Rigshospitalet, University of Copenhagen, DK-2100 Copenhagen, Denmark
2. Diabetes Research Division, Department of Internal Medicine (F.K.K., M.C.), Gentofte Hospital, University of Copenhagen, DK-2900 Hellerup, Denmark
3. The NNF Center for Basic Metabolic Research, Department of Biomedical Sciences (F.K.K., J.J.H.), the Panum Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark