Abdelrhman, T. M., M. S. Al Saeed, S. A. Badr, M. A. Shaban, A. Abuduruk, and M. Hatem. “Validity of RIPASA Scoring System As a Diagnostic Tool of Acute Appendicitis in Comparison With Alvarado Scoring System in the Arab Population”. International Surgery Journal, vol. 5, no. 6, May 2018, pp. 2011-7, doi:10.18203/2349-2902.isj20182212.