1. Department of Pediatrics; Nyi Ageng Serang District Hospital; Yogyakarta Indonesia
2. Faculty of Medicine, Department of Pediatrics, Dr Sardjito Hospital; Universitas Gadjah Mada; Yogyakarta Indonesia
3. Department of Pediatrics; Moi Teaching and Referral Hospital; Eldoret Kenya
4. Department of Epidemiology and Biostatistics; VU University Medical Center; Amsterdam The Netherlands
5. Department of Pediatric Oncology-Hematology; VU University Medical Center; Amsterdam The Netherlands