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.
Effect of variations in the relative benefit of bilateral lung transplantation (BLT) compared with single lung transplantation (SLT) for chronic obstructive pulmonary disease (COPD) and waitlist size on the total post-transplant survival of 1,000 potential recipients. HR = hazard ratio.
