1. Institute of Transfusion Medicine and Immunology, Medical Faculty MannheimGerman Red Cross Blood Donor Service Baden‐Württemberg‐Hessen gGmbH, Heidelberg University Mannheim Germany
2. FlowCore Mannheim, Medical Faculty MannheimHeidelberg University Germany
3. Department for Children and Adolescents, Division for Stem Cell Transplantation and ImmunologyUniversity Hospital Frankfurt Frankfurt am Main Germany
4. Institute for Transfusion Medicine and Immunohaematology, German Red Cross Blood Donor Service Baden‐Württemberg‐Hessen gGmbHGoethe University Hospital Frankfurt am Main Germany