1. Division of Digestive Surgery, Department of General Surgery, School of Medicine Universitas Padjadjaran, Hasan Sadikin General Hospital Bandung Indonesia
2. Faculty of Medicine Universitas Pelita Harapan Tangerang Indonesia
3. Faculty of Medicine Maranatha Christian University Bandung Indonesia
4. Department of General Surgery, Faculty of Medicine Universitas Pelita Harapan Tangerang Indonesia