Mortara, G., et al. “Surgical Treatment of Inflammatory Bowel Diseases in Northwestern Italy: A Multicentric Study by the G.S.M.I.I”. Annali Italiani Di Chirurgia, vol. 74, no. 3, May 2003, pp. 319-26, https://annaliitalianidichirurgia.it/index.php/aic/article/view/2950.