Memon, P. ., G. . Haider, A. Shahid, B. . Pavan, R. . Rahul, and S. . Beg. “Association of ABO Blood Group With Clinicopathological Factors Among Gastric Cancer Patients in Tertiary Care Hospital”. Pakistan Journal of Medical Research, vol. 60, no. 4, Jan. 2022, pp. 155-8, https://pjmr.org.pk/index.php/pjmr/article/view/150.