Kim, Jae-Young
Han, Michael D.
Jeon, Kug Jin
Huh, Jong-Ki
Park, Kwang-Ho
Article History
Received: 28 October 2020
Accepted: 4 February 2021
First Online: 16 February 2021
Ethics approval and consent to participate
: This study was approved by the institutional review board of Gangnam Severance Hospital (approval No. #3-2019-0236) and complied with the tenets of the Declaration of Helsinki. Written or verbal informed consent was waived by the IRB of Gangnam Severance Hospital, as this study had a retrospective design and all data were analyzed anonymously.
: Not applicable.
: The authors declare that they have no competing interests.