1. Department of Neonatology, Medical Faculty, RWTH Aachen University, D-52062 Aachen, Germany
2. Department of Hematology, Oncology, Hemostaseology and Stem Cell Transplantation, Medical Faculty, RWTH Aachen University, D-52062 Aachen, Germany
3. Helmholtz‑Institute for Biomedical Engineering, Stem Cell Biology and Cellular Engineering, Medical Faculty, RWTH Aachen University, D-52062 Aachen, Germany