Kimani, M., Kiiru, J., Matu, M., Chokwe, T. and Saidi, H. (2010) “Evaluation of POSSUM and P-POSSUM as predictors of mortality and morbidity in patients undergoing laparotomy at a referral hospital in Nairobi, Kenya”, Annals of African Surgery, 5(1). doi: 10.4314/aas.v5i1.53715.