Kim, Yong Tae
Yoo, Je-Hyun
Kim, Min Ki
Kim, Sanghyun
Hwang, Jihyo http://orcid.org/0000-0002-9141-9856
Article History
Received: 29 September 2017
Accepted: 4 January 2018
First Online: 17 January 2018
Compliance with ethical standards
: This research did not receive any support or grant from funding agencies in the public, commercial, or not-for-profit sectors. All authors declare that they have no conflict of interest. Institutional Review Board approval was obtained, and the study was in compliance with the Declaration of Helsinki.