Comparison of transnasal small-caliber vs. peroral conventional esophagogastroduodenoscopy for evaluating varices in unsedated cirrhotic patients. - Choe WH; Kim JH; Ko SY; Kwon SY; Kim BK; Rhee KH; Seo TH; Lee TY; Hong SN; Lee SY; Sung IK; Park HS; et al. (Endoscopy, 2011)