Extrahepatic anterograde covered self-expandable metallic stent placement across malignant biliary obstruction passed by endoscopic ultrasound guidance access: a challenging techni... oleh Everson L A Artifon, Flavio Ferreira, Gustavo Benevides, Federico H Marcaccio, Jose Pinhata Otoch, Jonas Takada, Francisco C Carnevale, Antonio M Mota, Eduardo Moura, Samir Rasslan, Luiz Poli de Figueiredo, Paulo Sakai