Baek, Byung Hyun
Yoon, Woong
Lee, Yun Young
Park, Ilwoo
Kim, Seul Kee
Article History
Received: 14 June 2018
Accepted: 30 October 2018
First Online: 6 November 2018
Compliance with ethical standards
:
: No funding was received for this study.
: The authors declare that they have no conflict of interest.
: 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 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.
: For this type of retrospective study formal consent is not required.