Funding for this research was provided by:
University of Seoul (NA)
Received: 12 May 2020
Accepted: 13 August 2020
First Online: 24 August 2020
Ethics approval and consent to participate
: This study was exempt from the institutional ethical review board at the University of Seoul (IRB No. 2019–24). All participants provided their written informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.