Willy Hardy Marpaung
* Corresponding Author Pediatric Surgery Division, Department of Surgery, Faculty of Medicine, Universitas Gadjah Mada/Dr. Sardjito General Hospital, Yogyakarta,
Department of Surgery, Raden Mattaher Hospital, Jambi, Indonesia
. Rochadi Pediatric Surgery Division, Department of Surgery, Faculty of Medicine, Universitas
Gadjah Mada/Dr. Sardjito General Hospital, Yogyakarta,