Funding for this research was provided by:
Korea Health Industry Development Institute (HI18C0446)
Received: 17 December 2019
Accepted: 19 June 2020
First Online: 3 July 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board (IRB) of Seoul National University Hospital (IRB no. E-1810-008-975) and the National Health Insurance Service of Korea (NHIS-2019-1-487). Informed consent was waived for this study because secondary data were used.
: Not applicable
: The authors declare that they have no competing interests.