1. University of Tübingen, Department of Internal Medicine II, Division of Hematology, Immunology, Oncology and Rheumatology, Tübingen, Germany
2. University Children's Hospital, Department of Hematology/Oncology, Tübingen, Germany
3. Boehringer Ingelheim Austria, Department of Exploratory Research, Research and Development, Vienna, Austria
4. University of Tübingen, Department of Internal Medicine IV, Division of Diabetes Research, Tübingen, Germany