Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Michael O. Blackstone and Robert H. Riddell and B.H.Gerald Rogers and Bernard Levin,Dysplasia-associated lesion or mass (DALM) detected by colonoscopy in long-standing ulcerative colitis: An indication for colectomy,Gastroenterology,0016-5085,Elsevier BV,1981-02,80,2,366-374,https://cir.nii.ac.jp/crid/1361137046417360000,https://doi.org/10.1016/0016-5085(81)90727-7