Kim, Ji-Eun
Kim, Jung Hoon
Park, Sang Joon
Choi, Seo-Youn
Yi, Nam-Joon
Han, Joon Koo
Article History
First Online: 5 January 2019
Compliance with ethical standards
:
: All authors confirm that no disclosure of potential conflicts of interest.
: This retrospective study was approved by our institutional review board, and the requirement to obtain written, informed consent was waived.