Endoscopic Submucosal Resection with Double Ligation Technique for Treatment of Small Rectal Carcinoid Tumors - Moon, J H; Kim, J H; Park, C H; Jung, J O; Shin, W G; Kim, J P; Kim, K O; Hahn, T; Yoo, K -S; Park, S H; Park, C K (Endoscopy, 2006)