TONELLI, F., and G.M. PAROLI. “COLORECTAL CROHN’S DISEASE: INDICATIONS TO SURGICAL TREATMENT”. Annali Italiani Di Chirurgia, vol. 74, no. 6, Nov. 2003, pp. 665-72, https://annaliitalianidichirurgia.it/index.php/aic/article/view/2811.