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Received 21 March 2019. Revision received 16 April 2019. Accepted 27 April 2019. 1 Department of General and Transplant Surgery, Niguarda Hospital, Milano, Italy. 2 School of Medicine and Surgery, University of Milano-Bicocca, Milano, Italy. The authors confirm that each author has participated sufficiently in the intellectual content, the analysis of data, and the writing of the manuscript to take public responsibility for it. Each author has reviewed the manuscript, believes it represents valid work, and approves it for submission. A.G. was involved in conception, literature analysis, and preparation of the draft. L.C. was involved in manuscript revision and literature analysis. S.F. was involved in manuscript revision and editing. M.T. was involved in manuscript revision. L.D. is a director and was involved in manuscript revision. The authors declare no funding or conflicts of interest. Correspondence: Alessandro Giacomoni, MD, FEBS, Department of General and Transplant Surgery, Niguarda Hospital, Blocco Sud – Piazza Ospedale Maggiore 3, 20162 Milano, Italy. ([email protected]).