Funding for this research was provided by:
National Research Foundation of Korea (2019R1F1A1058426)
Article History
Received: 30 November 2020
Accepted: 27 January 2021
First Online: 4 March 2021
Declarations
:
: The project was approved by Institutional Review Board of Seoul National University Hospital (No. 1906-141-1043)
: The requirement to obtain written informed consent was waived by the Institutional Review Board, because our study was retrospective research based on medical records, and also because this research presented no more than minimal risk of harm to subjects
: The study was carried out according to the Declaration of Helsinki
: The authors declare no competing interests.