Funding for this research was provided by:
Ministry of Education (2018R1D1A1B07050245)
Received: 18 August 2019
Accepted: 13 February 2020
First Online: 26 February 2020
Ethics approval and consent to participate
: Informed written consent was obtained from all participants. After providing a complete description of the study, including a statement that the questionnaire results would be used for the purpose of the study while remaining confidential, informed consent was provided by all participants. Approval for this study was obtained from the Institutional Review Board of Kongju National University.
: Not applicable.
: The authors declare that they have no competing interests.