Article History
Received: 22 September 2021
Revised: 9 November 2021
Accepted: 12 November 2021
First Online: 17 November 2021
Declarations
:
: Il-Hyun Kim, Young-Sil An, Su Jin Lee, and Joon-Kee Yoon declare that they have no competing interests.
: This study was approved by the Institutional Review Board (AJIRB-MED-EXP-21) and has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. The institutional review board waived the need to obtain informed consent.
: The institutional review board waived the need to obtain informed consent because of the anonymity and the retrospective nature of the study.