1. Office for National Statistics. Cancer registration statistics, England Statistical bulletins. https://www.ons.gov.uk/peoplepopulationandcommunity/healthandsocialcare/conditionsanddiseases/bulletins/cancerregistrationstatisticsengland/previousReleases.
2. ISD Scotland. Information Services Division [Internet]. http://www.isdscotland.org/.
3. Queen’s University Belfast, N. Ireland Cancer Registry. Official Statistics [Internet]. https://www.qub.ac.uk/research-centres/nicr/CancerInformation/official-statistics/.
4. The changing epidemiology of esophageal cancer;Blot;Semin Oncol,1999