Seo, Je Hyun http://orcid.org/0000-0003-3127-7160
Lee, Young
Shin, Jong Hoon
Kim, Ye An
Park, Keun Heung
Article History
Received: 14 March 2019
Revised: 2 July 2019
Accepted: 2 July 2019
First Online: 10 July 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: As this study was designed retrospectively, which was conducted on already available data, for which formal consent is difficult to obtain, the Pusan National University Yangsan Hospital Institutional Research Committee approved the consent waiver on the assumption that the security of personal information is well managed (IRB No. 05-2017-146).