Demirci, Hakan, et al. “Influence of Vitamin C and E Supplementation on the Eradication Rates of Triple and Quadruple Eradication Regimens for Helicobacter Pylori Infection”. Turkish Journal of Gastroenterology, vol. 26, no. 6, Jan. 2015, pp. 456-60, doi:10.5152/tjg.2015.0233.