Bakhti, Seyedeh Zahra, et al. “Helicobacter Pylori VacA C1 Genotype Is a Benefit Biomarker for Prediction of Gastric Cancer Risk in Ardabil”. International Clinical Neuroscience Journal, vol. 3, no. 3, Dec. 2016, pp. 164-9, doi:10.22037/icnj.v3i3.14684.