1. Department of Internal Medicine (K.S., N.S., H.S., F.M., M.K., A.F., H.-U.H.), Division of Endocrinology, Metabolism and Pathobiochemistry, University of Tübingen, 72076 Tübingen, Germany;
2. Third Medical Department (M.D.B., D.B., R.G.B.), Justus-Liebig-University of Giessen, 35390 Giessen, Germany;
3. Marienhospital Stuttgart (M.K.), Department of Internal Medicine I, 70199 Stuttgart, Germany;
4. Third Medical Department (M.S.), University of Leipzig, 04109 Leipzig, Germany