An official website of the United States government
Here’s how you know
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.
... article on PubMed Central
Plentz RR, Malek NP. Clinical presentation, risk factors and staging systems
of cholangiocarcinoma. Best Pract Res Clin Gastroenterol. ...