Funding for this research was provided by:
Korea Health Industry Development Institute (HI18C2383)
Received: 1 April 2020
Accepted: 31 May 2020
First Online: 15 June 2020
Ethics approval and consent to participate
: The study design and waiver of the requirement for informed consent were approved by the Asan Medical Center’s institutional review board (IRB) (2019-1484).
: Not applicable
: The authors declare that they have no conflicts of interest.