Zucchetti, F., et al. “Colorectal Cancer: Obstruction Is an Independent Negative Prognostic Factor After Radical Resection”. Annali Italiani Di Chirurgia, vol. 73, no. 4, July 2002, pp. 421-5, https://annaliitalianidichirurgia.it/index.php/aic/article/view/556.