Bing, Jong-Hyun
Choi, Soo-Jung
Jung, Seung-Moon
Ryu, Dae-Shick
Ahn, Jae-Hong
Kang, Chae-Hoon
Shin, Dong-Rock
Article History
Received: 17 November 2017
Revised: 4 March 2018
Accepted: 23 April 2018
First Online: 5 May 2018
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: The authors declare that they have no conflicts of interest.
: The requirement for written informed consent was waived by the Institutional Review Board for this retrospective review.
: This study was approved by the institutional review board, which waived the requirement for informed patient consent.