ePTFE/FEP-covered metallic stents for palliation of malignant biliary disease: Can tumor ingrowth be prevented? - Hatzidakis, A.; Krokidis, M.; Kalbakis, K.; Romanos, J.; Petrakis, I.; Gourtsoyiannis, N. (CardioVascular and Interventional Radiology, 2007)