EJSO, 43(12), 2324-2332. ELSEVIER SCI LTD BASE-Bielefeld Academic Search Engine Szakmany, T, Ditai, J, Kirov, M, Protsenko, D, Osinaike, B, Venara, A, Demartines, N, Hubner, M, Pearse, R M, Prowle, J R, International Surgical Outcomes Study (ISOS) group, Christiansen, I C, Granum, S N & Rasmussen, B S 2017, ' In-hospital clinical outcomes after upper gastrointestinal surgery : Data from an international observational study ', European Journal of Surgical Oncology, vol. 43, no. 12, pp. 2324-2332 . https://doi.org/10.1016/j.ejso.2017.08.002 European journal of surgical oncology European Journal of Surgical Oncology, 43(12), 2324-2332. W.B. Saunders Ltd European journal of surgical oncology, 43(12), 2324-2332. W.B. Saunders Ltd European journal of surgical oncology, vol. 43, no. 12, pp. 2324-2332 Szakmany, T, Ditai, J, Kirov, M, Protsenko, D, Osinaike, B, Venara, A, Demartines, N, Hubner, M, Pearse, R M, Prowle, J R & International Surgical Outcomes Study 2017, ' In-hospital clinical outcomes after upper gastrointestinal surgery : Data from an international observational study ', European Journal of Surgical Oncology, vol. 43, no. 12, pp. 2324-2332 . https://doi.org/10.1016/j.ejso.2017.08.002