1. Pediatric Surgery Division, Department of Surgery, Faculty of Medicine, Universitas Gadjah Mada/Dr Sardjito Hospital, Yogyakarta, Indonesia
2. Oncologic Surgery Division, Department of Surgery, Faculty of Medicine, Universitas Gadjah Mada/Dr Sardjito Hospital, Yogyakarta, Indonesia
3. Neurosurgery Division, Department of Surgery, Faculty of Medicine, Universitas Gadjah Mada/Dr Sardjito Hospital, Yogyakarta, Indonesia
4. Pediatric Surgery Division, Wilhelmina Kinderziekenhuis, UMC Utrecht, Utrecht, the Netherlands