1. Division of Endocrinology and Metabolism, Department of Internal Medicine III, Medical University of Vienna, Austria
2. Department of Clinical Pharmacology, Medical University of Vienna, Vienna, Austria
3. Third Medical Department of Metabolic Diseases and Nephrology, Hietzing Hospital, Vienna, Austria
4. Karl Landsteiner Institute of Metabolic Diseases and Nephrology, Hietzing Hospital, Vienna, Vienna, Austria
5. Department of Surgery, Medical University of Vienna, Vienna, Austria
6. Metabolic Unit, Institute of Biomedical Engineering, National Research Council, Padova, Italy