1. Helmholtz Institute for Biomedical Engineering, Department of Cell Biology, RWTH Aachen University Medical School, 52074 Aachen, Germany
2. Department of Medicine V, University of Heidelberg, 69120 Heidelberg, Germany
3. Institute for Biomedical Aging Research, Rennweg 10, 6020 Innsbruck, Austria
4. Reference and translational center for cardiac stem cell therapy, University of Rostock, 18057 Rostock, Germany
5. Stem Cell Research Unit Graz, Medical University of Graz, 8036 Graz, Austria