Article History
Received: 20 September 2019
Accepted: 19 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: The research was approved by the Dankook Hospital Ethics Committee (2019–05-003). All participants were informed that participation was voluntary and provided written, informed consent. No competing interests.
: Not applicable.
: The authors declare that they have no competing interests.