Yoo, Min Young
Koong, Sung-Soo
Kim, Si-Wook
Kim, Dohun
Article History
Received: 30 January 2019
Revised: 5 March 2019
Accepted: 11 March 2019
First Online: 26 March 2019
Compliance with Ethical Standards
:
: Min Young Yoo, Sung-Soo Koong, Si-Wook Kim, and Dohun Kim 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.
: The institutional review board of our institute approved this retrospective study, and the requirement to obtain informed consent was waived.