A subepithelial lesion in a patient with long-standing ulcerative colitis

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Suhyun Park (Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine) ;
Jihun Kim (Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine) ;
Dong-Hoon Yang (Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine)

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