Kang, Pil Moon
Kim, Young Jin
Seo, Won Tae
Kang, Su Hwan
Kim, Taek Sang
Chun, Bong Kwon
Seo, Won Ik
Jeong, Jee-Yeong
Chung, Jae Il
Article History
Received: 11 December 2017
Accepted: 25 July 2018
First Online: 1 August 2018
Compliance with ethical standards
:
: The author(s) declare that they have no competing interests.
: Informed consent was obtained from all individual participants included in the study.
: 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.