1. Department of Pediatric Oncology/Hematology, University Medical Center Charité, Berlin, Germany
2. Institute of Pharmacy, Freie Universität Berlin, Berlin, Germany
3. Department of Pediatric Oncology, Children's Hospital of the City of Cologne, Cologne, Germany
4. Institute of Phamacy and Molecular Biotechnology, Im Neuenheimer Feld 364, 69120 Heidelberg, Germany
5. Department of Pharmaceutical Chemistry, Institute of Pharmacy, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria