Self-Expanding Metal Stenting for Palliation of Patients with Malignant Colonic Obstruction: Effectiveness and Efficacy on 255 Patients with 12-Month's Follow-up oleh Søren Meisner, Ferran González-Huix, Jo G. Vandervoort, Alessandro Repici, Dimitrios Xinopoulos, Karl E. Grund, Paul Goldberg, The WallFlex Colonic Registry Group