M. R. AL-Robeyii, M. R. AL-Robeyii, N. G. AL-Khayli, and K. AL-Mousawy, “The role of pepsinogen test among the patients with gastric cancer”., JFacMedBagdad, vol. 52, no. 2, pp. 193–197, Jul. 2010, doi: 10.32007/jfacmedbagdad.5221022.