Kang, Jihun http://orcid.org/0000-0001-9232-5563
Song, Yun-Mi http://orcid.org/0000-0002-2263-9054
Article History
Received: 27 November 2017
Accepted: 29 December 2017
First Online: 16 January 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study’s retrospective protocol was approved by the institutional review board of the Armed Forces Medical command (Seongnam, South Korea; AFMC-17003-IRB-17-002), which waived the requirement for informed consent.