Kouli, O, Murray, V, Bhatia, S, Cambridge, W A, Kawka, M, Shafi, S, Knight, S, Kamarajah, S K, Mclean, K, Glasbey, J C, Bhangu, A, Creagh-Brown, B, Edwards, M, Harrison, E M, Lee, M, Nepogodiev, D, Pinkney, T, Pockney, P, Pearse, R, Richards, T, N, S & R, V 2022, ' Evaluation of prognostic risk models for postoperative pulmonary complications in adult patients undergoing major abdominal surgery : a systematic review and international external validation cohort study ', The Lancet Digital Health, vol. 4, no. 7, pp. e520-e531 . https://doi.org/10.1016/S2589-7500(22)00069-3 2022, ' Evaluation of prognostic risk models for postoperative pulmonary complications in adult patients undergoing major abdominal surgery: a systematic review and international external validation cohort study ', The Lancet. Digital health, vol. 4, no. 7, pp. e520-e531 . https://doi.org/10.1016/S2589-7500(22)00069-3 e531 e520