Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(A-E) Retrieved biliary plastic stents with the inner layer exposed by longitudinal cutting. The dark greenish biofilms do not contribute significantly to increased thickness of the occluded inner layer. Stent occlusion is mostly caused by debris, sludge, and food components.
