Kim, Sang-A
Lee, Jayoun
Moon, Joon Ho
Lee, Hyewon
Jang, Junho
Cheong, June-Won
Youk, Jeonghwan
Choi, Yeonjoo
Kang, Minjoo
Shin, Minkyung
Koh, Youngil
Shin, Sangjin
Article History
Received: 4 April 2018
Accepted: 8 November 2018
First Online: 19 November 2018
Compliance with ethical standards
:
: Sang-A Kim declares that there is <i>no conflict of interest</i> regarding the work described in this article.Jayoun Lee declares that there is <i>no conflict of interest</i> regarding the work described in this article.Junho Moon declares that there is <i>no conflict of interest</i> regarding the work described in this article.Hyewon Lee declares that there is <i>no conflict of interest</i> regarding the work described in this article.Junho Jang declares that there is <i>no conflict of interest</i> regarding the work described in this article.June-Won Cheong declares that there is <i>no conflict of interest</i> regarding the work described in this article.Jeonghwan Youk declares that there is <i>no conflict of interest</i> regarding the work described in this article.Yeonjoo Choi declares that there is <i>no conflict of interest</i> regarding the work described in this article.Minkyung shin declares that there is <i>no conflict of interest</i> regarding the work described in this article.Youngil Koh declares that there is <i>no conflict of interest</i> regarding the work described in this article.Sangjin Shin declares that there is <i>no conflict of interest</i> regarding the work described in this article.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was waived due to the retrospective nature of this study.