Article History
Received: 14 June 2019
Accepted: 8 July 2020
First Online: 20 July 2020
Compliance with ethical standards
:
: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
: The protocol of this study was reviewed and approved by the Yonsei University Research Ethics committee before the implementation.
: Each participant was given detail information about the project which they read and freely accepted to participate. For those who accepted, they signed informed consent form and returned it to the surveyor before receiving the questionnaire to be self-administered.