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) Temporal trend of coronary perforation. Bubble plot illustrating stable incidence of coronary perforation over the last four decades. Sample size of study represented by bubble size. (B) Temporal trend of Ellis grade III perforation. Bubble plot illustrating increasing incidence of Ellis grade III perforation over the last three decades. Sample size of study represented by bubble size.
