(n.d.) What is GI Cancer?, retrieved 16 December 2019 from GI Cancer Institute, https://gicancer.org.au/gi-cancer-explained/
(n.d.) Singapore Cancer Registry Annual Registry Report 2015, retrieved 2 January 2020 from National Registry of Diseases Office, https://www.nrdo.gov.sg/docs/librariesprovider3/Publications-Cancer/cancer-registry-annual-report-2015_web.pdf?sfvrsn=10
18 July 2019. Hepatitis B, retrieved 3 January 2020 from World Health Organization (WHO), https://www.who.int/news-room/fact-sheets/detail/hepatitis-b
(n.d.) Common Types of Cancer in Singapore, retrieved 2 January 2020 from Singapore Cancer Society, https://www.singaporecancersociety.org.sg/learn-about-cancer/cancer-basics/common-types-of-cancer-in-singapore.html
(n.d.) Stomach Cancer, retrieved 16 December 2019 from Mayo Clinic, https://www.mayoclinic.org/diseases-conditions/stomach-cancer/symptoms-causes/syc-20352438
21 June 2017. Breast, prostate cancers rising sharply in Singapore, retrieved 2 January 2020 from The Straits Times, https://www.straitstimes.com/singapore/health/breast-prostate-cancers-rising-sharply-in-spore
(n.d.) Colon Cancer, retrieved 2 January 2020 from Mayo Clinic, https://www.mayoclinic.org/diseases-conditions/colon-cancer/symptoms-causes/syc-20353669