Reduction of butyric acid-producing bacteria in the ileal mucosa-associated microbiota is associated with the history of abdominal surgery in patients with Crohn's disease. - Handa, Osamu; Miura, Hiroto; Gu, Tingting; Osawa, Motoyasu; Matsumoto, Hiroshi; Umegaki, Eiji; Inoue, Ryo; Naito, Yuji; Shiotani, Akiko (Redox Report, 2023)