1. Department of Pediatric Oncology, Hematology and Immunology, Center for Child and Adolescent Health, Heinrich-Heine-University, Duesseldorf, Germany
2. Institute of Medical Microbiology and Hospital Hygiene, Heinrich Heine-University, Duesseldorf, Germany
3. Institute of Radiology, Heinrich Heine-University, Duesseldorf, Germany
4. Department of General Pediatrics, Heinrich Heine-University, Duesseldorf, Germany