Fig. 1From: Partially covered metal stents have longer patency than uncovered and fully covered metal stents in the management of distal malignant biliary obstruction: a retrospective studyKaplan–Meier graph showing survival among the three groups. There were no significant differences between uncovered vs partially covered (p = 0.482); partially covered vs fully covered (p = 0.928); and fully covered vs uncovered (p = 0.203) groupsBack to article page