1. Department of Medicine, University of Leipzig, Leipzig, Germany;
2. University Hospital for Children and Adolescents, University of Leipzig, Leipzig, Germany;
3. Interdisciplinary Centre for Clinical Research, University of Leipzig, Germany;
4. Coordination Centre for Clinical Trials, University of Leipzig, Germany;
5. St. Elisabeth Hospital, Medical Department, Leipzig, Germany;
6. Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts;
7. Department of Surgery, University of Leipzig, Leipzig, Germany;
8. Department of Surgery, Städtisches Klinikum Karlsruhe, Germany.