Percutaneous treatment of malignant jaundice due to extrahepatic cholangiocarcinoma: Covered Viabil stent versus uncovered Wallstents - Krokidis, M.; Fanelli, F.; Orgera, G.; Bezzi, M.; Passariello, R.; Hatzidakis, A. (CardioVascular and Interventional Radiology, 2010)