1. Department of Hepatobiliary Surgery, National Hospital of Tropical Diseases, Hanoi, Vietnam
2. Department of Gastrointestinal and Hepato-Pancreato-Biliary Surgery, Bach Mai Hospital, Hanoi, Vietnam
3. Department of Oncology, Viet Duc University Hospital, Hanoi, Vietnam
4. Organ Transplantation Center, Viet Duc University Hospital, Hanoi, Vietnam
5. Department of Anatomy, Hanoi Medical University, Hanoi, Vietnam
6. 108 Institute of Clinical Medical and Pharmaceutical Sciences, Hanoi, Vietnam