1. Institute of Pathology; Hannover Medical School; Hannover Germany
2. Division of Pediatric Hematology and Oncology; University Hospital Carl Gustav Carus; Technical University Dresden; Dresden Germany
3. Institute of Pathology; Health Center Böblingen; Böblingen Germany
4. Department of Pediatrics and Adolescent Medicine, Division of Pediatric Hematology and Oncology; Medical Center - University of Freiburg; Faculty of Medicine, University of Freiburg; Germany