Babu K., D., and M. Bhaskar. “A Clinical Study of Factors Affecting the Prognosis in Duodenal Ulcer Perforation Cases in Tertiary Care Hospital, Kanchipuram District”. International Surgery Journal, vol. 6, no. 12, Nov. 2019, pp. 4290-3, doi:10.18203/2349-2902.isj20195214.