1. Immunocompromised Host Section, Pediatric Oncology Branch, Clinical Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, Maryland
2. Department of Pharmacology, Medical Faculty, Aristotle University
3. SAIC—Frederick, Inc., Frederick, Maryland 21702
4. 3rd Pediatric Department, Aristotle University, Hippokration Hospital, Thessaloniki, Greece