Im, Hyo Won
Kim, Seung Yeun
Oh, Byung-Mo
Han, Tai Ryoon
Seo, Han Gil http://orcid.org/0000-0001-6904-7542
Article History
Received: 9 July 2018
Accepted: 26 March 2019
First Online: 3 April 2019
Compliance with Ethical Standards
:
: The authors report no conflicts of interest. The authors alone are solely responsible for the content and writing of the paper.
: This study was conducted in conformance with the ethical standards of the Declaration of Helsinki (1964) and was approved by the Institutional Review Board of our institution before study initiation (IRB No. 1605-030-760). The requirement for informed consent was waived because of the retrospective nature of the study.