1. Division of HPB Surgery, Department of Surgery, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka
2. The University Surgical Unit, The National Hospital of Sri Lanka
3. Department of Pathology, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka
4. Department of Histopathology, National Cancer Institute, Maharagama, Sri Lanka
5. Department of Oncology, National Cancer Institute, Maharagama, Sri Lanka
6. Department of Anaesthesiology, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka