1Department of Thoracic and Cardiovascular Surgery, Yeungnam University Medical Center, Yeungnam University College of Medicine, Daegu, Korea
2Department of Thoracic and Cardiovascular Surgery, Kosin University College of Medicine, Busan, Korea
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Conflicts of interest
No potential conflict of interest relevant to this article was reported.
Funding
None.
Author contributions
All the work was done by JHB and HL.