1. Center for Biomedical Research, University of Ulm, Ulm, Germany
2. Institute of Legal Medicine, University of Ulm, Ulm, Germany
3. Max Delbrueck Center for Molecular Medicine, Berlin, Germany
4. Department of Internal Medicine, University of Essen, West German Cancer Center, Essen, Germany
5. University Children's Hospital, University of Ulm, Ulm, Germany