1. Department of Pediatrics, DR. Sardjito Hospital-Faculty of Medicine, Gadjah Mada University, Yogyakarta, Indonesia,
2. Department of Pediatric Hematology-Oncology, Vrije University Medical Center, Vrije University, Amsterdam, the Netherlands,
3. Department of Pediatrics, Faculty of Medicine, Gadjah Mada University, Yogyakarta, Indonesia, pur_ignas@ yahoo.com
4. Department of Psycho-Social Research and Epidemiology, Dutch Cancer Institute-Antoni van Leeuwenhoek Hospital, Amsterdam, the Netherlands,
5. Department of Pediatric Hematology-Oncology, Vrije University Medical Center, Vrije University, Amsterdam, the Netherlands