Lee, Jeong-Won
Park, Jeong-Yeol
Lee, Hyun Ju
Lee, Jong Jin
Moon, Seung Hwan
Kang, Seo Young
Cheon, Gi Jeong
Chung, Hyun Hoon http://orcid.org/0000-0002-5158-7492
Article History
Received: 7 November 2017
Accepted: 11 February 2018
First Online: 28 February 2018
Compliance with ethical standards
:
: None.
: 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 principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. For this type of retrospective study, formal consent is not required.