Article History
First Online: 3 September 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflicts of interest. Author Sohyune R. Sok declares that she has no conflict of interest. Author Mi Hyeon Seong declares that she has no conflict of interest. Author Mi Hye Ryu declares that she has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.