1. Institute of Clinical Immunology, Medical Faculty University of Leipzig Leipzig Germany
2. Department of Pediatrics, Dr. von Hauner Children's Hospital University Hospital, Ludwig‐Maximilians‐University of Munich Munich Germany
3. German Centre for Infection Research (DZIF) Munich Germany
4. Institute of Cellular Therapeutics Hannover Medical School Hannover Germany
5. Fraunhofer Institute for Immunology and Cell Therapy (IZI) Leipzig Germany
6. Institute of Virology, Medical Faculty University of Leipzig Leipzig Germany
7. Department of Women and Child Health, Hospital for Children and Adolescents Hospitals University of Leipzig Leipzig Germany