T. J. Al-Marzooq, R. E. Naji, A. K. Al-Majidi, and Y. Abbas, “The use of serum Amylase as a predictive factor for mortality in Perforated Duodenal Ulcer”, J Fac Med Baghdad, vol. 57, no. 4, pp. 295–298, Jan. 2016, doi: 10.32007/jfacmedbagdad.574393.