- Correspondence to Dr Jae Won Lee, Department of Thoracic and Cardiovascular Surgery, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Pungnap-dong Songpa-gu, Seoul 138-736, South Korea;
- Received August 9, 2012
- Revised September 6, 2012
- Accepted September 6, 2012
- First published October 4, 2012.
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