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 reference citation was erroneously omitted from the second sentence of the second paragraph of the Introduction. The reference is: Byun KH, Kim SW. Is stem cell-based therapy going on or out for cardiac disease? Korean Circ J 2009;39:87-92.
Competing Interests: No competing interests declared.
