1. Global cancer statistics 2018: GLOBOCAN estimates of incidence and mortality worldwide for 36 cancers in 185 countries
2. Global cancer statistics, 2012
3. Oesophageal carcinoma
4. Sadjadi A, Nouraie M, Mohagheghi MA, Mousavi-Jarrahi A, Malekezadeh R, Parkin DM. Cancer occurrence in Iran in 2002, an international perspective. Asian Pac J Cancer Prev. 2005; 6(3): 359-63.
5. Yu Y, Taylor PR, Li J-Y, Dawsey SM, Wang G-Q, Guo W-D, et al. Retrospective cohort study of risk-factors for esophageal cancer in Linxian, People's Republic of China. Cancer Causes & Control. 1993;4(3):195-202.