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.
Directed acyclic graph to identify confounders in the association between major postoperative complications and adjuvant chemotherapy, and disease-free interval and overall survival after resection of pancreatic cancer
CA, carbohydrate antigen.
