[1
]
Department of Pediatric Hematology and -Oncology and Clinical -Immunology, Heinrich-Heine-University,
Duesseldorf, Germany.
[2
]
Paediatric Haematology and Oncology, Children's Hospital Medical Center, Bonn, Germany.
[3
]
Clinic for Pediatric Hematology and Oncology, University -Hamburg-Eppendorf, Germany.
[4
]
Laboratory for Experimental Hematology and DNA Repair Herman B Wells Center for Pediatric
Research, Indiana University, Indianapolis, USA and ENT Department, HNO, Duesseldorf,
Germany.
[5
]
Clinic for Pediatric Hematology and Oncology, Justus-Liebig Universtity, Giessen,
Germany.