Kim, Dong Wook https://orcid.org/0000-0002-9826-1326
Lee, Yoo Jin https://orcid.org/0000-0003-4701-7339
Ahn, Hye Shin
Baek, Hye Jin https://orcid.org/0000-0001-7349-2841
Ryu, Ji Hwa https://orcid.org/0000-0002-3033-1180
Kang, Taewoo https://orcid.org/0000-0002-6279-0904
Article History
Received: 9 August 2017
Accepted: 6 March 2018
First Online: 10 March 2018
Compliance with ethical standards
:
: All authors declare that there are no competing interests.
: 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 need for informed consent was waived owing to the retrospective nature of the study.