Park, Kwang Soon
Lee, Sun Hwa
Yun, Seong Jong http://orcid.org/0000-0002-3775-5701
Ryu, Seokyong
Kim, Keon
Article History
Received: 7 December 2017
Accepted: 21 February 2018
First Online: 26 February 2018
Compliance with ethical standards
:
: This study has been approved by the ethics committee and has been performed in accordance with the ethical standards laid down in the Declaration of Helsinki.
: Due to the retrospective nature of the study, no informed consent was obtained from the included cohort as judged by the ethics committee..
: The authors declare that there is no conflict of interest.