1. Helmholtz Pioneer Campus, Helmholtz Zentrum München, Munich, Germany
2. Institute of Diabetes and Regeneration Research, Helmholtz Zentrum München, D-85764 Neuherberg, Germany
3. Laboratory for MEMS Application, IMTEK-Department of Microsystems Engineering, University of Freiburg, Germany
4. TUM School of Medicine, Technical University of Munich, Munich, Germany
5. German Center for Diabetes Research (DZD), D-85764 Neuherberg, Germany
6. Institute of Stem Cell Research, Helmholtz Zentrum München, D-85764 Neuherberg, Germany