citation journal title = Diseases of the Colon amp Rectum citation issn = 00123706 citation volume = 33 citation issue = 8 citation doi = 101007/BF02150747 citation firstpage = 695 citation lastpage = 697 citation publication date = 1990/08/01 citation title = Endoscopic appearance of the colon and small intestine of a patient with hemorrhagic enteric graftvshost disease