Funding for this research was provided by:
National Research Foundation of Korea (2017R1C1B 5075783)
Received: 26 April 2018
Accepted: 4 July 2019
First Online: 26 July 2019
Ethics approval and consent to participate
: The study was approved by the university’s Institutional Review Board (no. 1041231–180312-HR-70-03). Ethical issues regarding plagiarism, informed consent, misconduct, data fabrication and/or falsification, double publication and/or submission, and redundancy have been completely observed by the authors.
: Not applicable.
: The authors declare that they have no competing interests.