Acknowledgement Jin Woo Chung, Korean Society for Thoracic and Cardiovascular Surgery 21 October 2014 This paper was written as part of Konkuk University's research support program for its faculty on sabbatical leave in 2009 Competing interests None declared
Acknowledgement
21 October 2014
This paper was written as part of Konkuk University's research support program for its faculty on sabbatical leave in 2009
Competing interests
None declared