1. Section for Transplantation Immunology and Immunohematology, Center for Medical Research, University Medical Clinic, University of Tübingen, Tübingen, Germany.
2. Interfaculty Institute for Biochemistry, Medical and Natural Sciences Research Center, University of Tübingen, Tübingen, Germany.
3. Department of Neonatology, University Children's Hospital, University of Tübingen, Tübingen, Germany.
4. Department of Orthopedic Surgery, Center for Medical Research, University of Tübingen, Tübingen, Germany.
5. Center for Regenerative Biology and Medicine, University of Tübingen, Tübingen, Germany.