Received: 28 July 2020
Accepted: 17 December 2020
First Online: 7 January 2021
Ethics approval and consent to participate
: The study was approved by Kangwon National University Institutional Review Board (KWNUIRB-2020-03-007-002), and conducted in agreement with the Declaration of Helsinki. In advance of their participation, all of the participants were fully informed about the purpose and experimental procedures of the study. Informed consent was obtained prior written from each participant. The participants were informed that all data collected would be processed anonymously.
: Not applicable.
: The authors declare that they have no competing interests.