Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKAHASHI Tomohiro and KIHARA Kyoichi and HARA Kazushi and TANIO Akimitsu and YAMAMOTO Manabu and FUJIWARA Yoshiyuki,Repeated Perforation of the Sigmoid Colon where Participation of Polystyrene Sulfonate was Suspected,Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association),13452843,Japan Surgical Association,2020,81,7,1346-1352,https://cir.nii.ac.jp/crid/1391412881287114112,https://doi.org/10.3919/jjsa.81.1346