1. Institute for Diabetes and Cancer (T.W., N.S.P.), Helmholtz Zentrum München, 85764 Neuherberg, Germany;
2. Institute of Clinical Chemistry and Laboratory Medicine (M.P., N.Q., G.E.), University Hospital Carl Gustav Carus, Medical Faculty Carl Gustav Carus
3. Department of Internal Medicine III (M.P., N.Q., G.E.), University Hospital Carl Gustav Carus
4. Institute of Experimental Genetics (F.N.), Helmholtz Zentrum München, 85764 Neuherberg, Germany;
5. Division of Molecular Endocrinology (M.E.-B., G.E.), Medical Clinic III, Technische Universität Dresden, 01307 Dresden, Germany