Kim, Sangwon http://orcid.org/0000-0002-2793-5610
Article History
First Online: 15 November 2019
Compliance with Ethical Standards
:
: The author declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
: The research process was approved by Sungkyunkwan University Institutional Review Board (Approval number: SKKU 2019–02-001).
: For this type of study using the secondary data, formal consent is not required.