Kwon, Oh Chan
Park, Yangsoon
Lee, Jung Sun
Oh, Ji Seon
Kim, Yong-Gil
Lee, Chang-Keun
Yoo, Bin
Hong, Seokchan https://orcid.org/0000-0001-8722-3124
Article History
Received: 10 May 2018
Revised: 16 July 2018
Accepted: 3 August 2018
First Online: 9 August 2018
Compliance with ethical standards
: This study was approved by the Institutional Review Board of the Asan Medical Center in Seoul, South Korea (IRB no. 2016-1258). Requirement for informed consent was waived because of the retrospective nature of the study.
: None.