Funding for this research was provided by:
Korea Health Industry Development Institute (HI15C0007)
National Research Foundation of Korea (2017R1A2B4004328)
Received: 1 August 2018
Accepted: 8 July 2020
First Online: 14 July 2020
Ethics approval and consent to participate
: All procedures performed in this study were in accordance with the ethical standards of the review board of the Chungnam National University Hospital. Agreement to participate and a signed consent form were obtained from all individual participants before data collection.
: Not applicable.
: The authors declare that they have no completing interests.