1. Department of Surgery University Surgical Cluster, National University Hospital, National University Health System Singapore
2. Yong Loo Lin School of Medicine National University of Singapore Singapore
3. Department of General Surgery Ng Teng Fong General Hospital, National University Health System Singapore
4. Division of General Surgery (Upper Gastrointestinal Surgery) University Surgical Cluster, National University Hospital, National University Health System Singapore
5. Division of Surgical Oncology National University Cancer Institute, National University Health System Singapore
6. Biostatistics Unit, Yong Loo Lin School of Medicine National University of Singapore Singapore
7. Saw Swee Hock School of Public Health National University of Singapore Singapore