badamchi, A. “Prevalence of Helicobacter Pylori VacA, CagA, CagE1, CagE2, DupA and OipA Genotypes in Patients With Gastrointestinal Diseases”. Acta Medica Iranica, Vol. 58, no. 7, Oct. 2020, pp. 310-7, doi:10.18502/acta.v58i7.4417.