Feizi-Khankandi, I., Reza-zadeh, A., Feizi, F. and Seyed-hatami, E. 2017. Comparison of Helicobacter pylori infection frequency in the cardia and distal esophageal cancer patients with healthy individuals. International Journal of Advances in Medicine. 3, 2 (Jan. 2017), 419–423. DOI:https://doi.org/10.18203/2349-3933.ijam20161103.