Endoscopic treatment of esophagogastric variceal bleeding in patients with noncirrhotic extrahepatic portal vein thrombosis: a long-term follow-up study - Spaander, M C; Darwish Murad, S; van Buuren, H R; Hansen, B E; Kuipers, E J; Janssen, H L (Gastrointest Endosc, 2008)