Jo, Woo-Lam
Lee, Young-Kyun
Ha, Yong-Chan
Kim, Tae-Young https://orcid.org/0000-0003-2028-0460
Koo, Kyung-Hoi
Article History
Received: 6 February 2018
Accepted: 16 April 2018
First Online: 26 April 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in this study 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 waived for this study.