Article History
Received: 1 August 2020
Accepted: 5 October 2020
First Online: 9 October 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: Youngok Lee received lecture fees from the 2019 SNUH Update in Thoracic and Cardiovascular Surgery Symposium, Seoul, South Korea. Tak-Hyuk Oh, Hanna Jung, and Joon Yong Cho have no conflict of interest.