Funding for this research was provided by:
National Research Foundation of Korea (NRF-2018R1D1A1B07043416)
Article History
Received: 8 January 2020
Accepted: 31 March 2020
First Online: 7 April 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: Ethical approval for the study was obtained from the Institutional Review Board of Kyungpook National University (IRB number: KNU 2018–0141). The requirement for informed consent from the study population was waived by the board because the data was anonymous.