Mathew, A., J. John, and A. Sasikumar. “Validity of Mannheim Peritonitis Index in Predicting Outcome of Patients With Perforative Peritonitis in a Tertiary Care Centre Kerala, India”. International Journal of Research in Medical Sciences, vol. 7, no. 11, Oct. 2019, pp. 4140-3, doi:10.18203/2320-6012.ijrms20194981.