Jung, Jo Sung
Choi, Yoon Seong
Ahn, Sung Soo
Yi, Seong
Kim, Se Hoon
Lee, Seung-Koo
Article History
Received: 19 September 2018
Accepted: 3 January 2019
First Online: 20 January 2019
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.