Thomas Zheng Jie Teng1, Yen Pin Tan2, Vishal G Shelat3. 1. Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore. 2. Department of General Surgery, Tan Tock Seng Hospital, Singapore. 3. Hepatobiliary and Pancreatic Surgery Unit, Department of General Surgery, Tan Tock Seng Hospital, Singapore.