Joo, Hyung Joon
Jeong, Han Saem
Kook, Hyungdon
Lee, Seung Hun
Park, Jae Hyoung
Hong, Soon Jun
Yu, Cheol Woong
Lim, Do-Sum http://orcid.org/0000-0001-5751-5177
Article History
Received: 28 August 2017
Accepted: 17 May 2018
First Online: 11 June 2018
Ethics approval and consent to participate
: This study was approved by the ethical committee of the institutional review board of Korea University Anam Hospital, and the need for written informed consent was waived owing to the non-interventional and retrospective nature of the study.
: The authors declare that they have no competing interests.
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