Extrahepatic anterograde covered self-expandable metallic stent placement across malignant biliary obstruction passed by endoscopic ultrasound guidance access: a challenging technique - Artifon, Everson L. A.; Ferreira, Flavio; Benevides, Gustavo; Marcaccio, Federico H.; Otoch, Jose Pinhata; Takada, Jonas; Carnevale, Francisco C.; Mota, Antonio M.; Moura, Eduardo; Rasslan, Samir; Figueiredo, Luiz Poli de; Sakai, Paulo (Acta Gastroenterologica Latinoamericana, 2012)