1. Duke-NUS Graduate Medical School; National University of Singapore; Singapore City Singapore
2. Saw Swee Hock School of Public Health; National University of Singapore; Singapore City Singapore
3. Division of Gastroenterology; University Medicine Cluster; National University Health System; Singapore City Singapore
4. Department of Medicine; Yong Loo Lin School of Medicine; National University of Singapore and National University Health System; Singapore City Singapore
5. Department of Gastroenterology & Hepatology; Singapore General Hospital; Singapore City Singapore
6. National Registry of Diseases Office; Health Promotion Board; Singapore City Singapore
7. Division of Cancer Control and Population Sciences; University of Pittsburgh Cancer Institute; Pennsylvania PA USA
8. Department of Epidemiology; University of Pittsburgh Graduate School of Public Health, Pittsburgh; Pennsylvania PA USA