Higashi D, Futami K, Kojima D, Uwatoko S, Shibata R, Miyasaka Y, Ohmiya T, Sakamoto R, Kaida H, Koreeda N, et al. Surgical treatment of Crohn's disease while distinguishing between perforating and non-perforating types. Med Bull Fukuoka Univ. 2021. 48. 1. 9-15