Received: 31 August 2020
Accepted: 10 February 2021
First Online: 19 February 2021
Ethics approval and consent to participate
: An ethical review was conducted and approved by the institutional review board of Dongguk University, Gyeongju (IRB approval number: DGU IRB 20190013). Informed consent was obtained from the participants.
: Not applicable.
: The authors have no competing interests.