1. Department of Pediatric Oncology/Hematology; VU University Medical Center; Amsterdam The Netherlands
2. Department of Pediatrics; Moi Teaching and Referral Hospital; Eldoret Kenya
3. Department of Pediatrics; Indiana University School of Medicine; Indianapolis IN USA
4. Department of Pediatrics; Dr. Sardjito Hospital; Yogyakarta Indonesia
5. Department of Epidemiology and Biostatistics; VU University Medical Center; Amsterdam The Netherlands