Funding for this research was provided by:
National Research Foundation of Korea (2017R1D1A1B03029050)
Korea Health Industry Development Institute (HI14C1324)
Received: 20 June 2019
Accepted: 28 June 2020
First Online: 7 July 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Severance Hospital, and the need for written informed consent was waived, as this was a retrospective study (4–2018-1083).
: Not applicable.
: The authors declare that they have no competing interests.