Funding for this research was provided by:
National Research Foundation of Korea (NRF-2015R1C1A1A0203708)
Received: 2 December 2019
Accepted: 3 June 2020
First Online: 9 June 2020
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board at Seoul National University Bundang Hospital, Korea (IRB No. B-1211/178–117). Informed consent was waived due to the retrospective nature of the study.
: Informed consent was waived due to the retrospective nature of the study.
: The authors declare that they have no conflict of interest.