1) Fukuda Y, Matsui T, Suzuki Y, et al:Adsorptive granulocyte and monocyte apheresis for refractory Crohn's disease:an open multicenter prospective study. J Gastroenterol 2004;39(12):1158-64 2) Yoshimura N, Yokoyama Y, Matsuoka K, et al:An open-label prospective randomized multicenter study of intensive versus weekly granulocyte and monocyte apheresis in active crohn's disease. BMC Gastroenterol 2015;15:163 3) Sands BE, Katz S, Wolfet DC, et al:A randomised, double-blind, sham-controlled study of granulocyte/monocyte apheresis for moderate to severe Crohn's disease. Gut 2013;62(9):1288-94