Funding for this research was provided by:
National Research Foundation of Korea (No. NRF-2017R1A2A2A05069746, No. NRF-2014R1A2A1A11051392)
Korea Health Industry Development Institute (HI18C0446)
Received: 17 March 2020
Accepted: 30 October 2020
First Online: 11 November 2020
Ethics approval and consent to participate
: This study was approved by the Seoul National University Hospital Institutional Review Board (IRB No. E-1805-047-944). Informed consent was waived by the board.
: Not applicable.
: The authors declare that they have no competing interests.