著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) RIDELL R. H.,Value of sigmoidoscopy and biopsy in detection of carcinoma and premalignant change in ulcerative colitis,Gut,,,1979,20,,575-580,https://cir.nii.ac.jp/crid/1570572701446783872,https://doi.org/10.1136/gut.20.7.575