1. Department of Child Health, Faculty of Medicine, Public Health and Nursing Universitas Gadjah Mada/Dr Sardjito Hospital Yogyakarta Indonesia
2. Pediatric Oncology, Emma's Children's Hospital, Amsterdam UMC Vrije Universiteit Amsterdam The Netherlands
3. Department of Mathematics, Faculty of Mathematics and Natural Sciences Universitas Gadjah Mada Yogyakarta Indonesia
4. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands