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Authors
Lee, Hankil https://orcid.org/0000-0002-7780-159X
Song, Dong-Ho
Kwon, Jin-Won
Han, Euna
Chang, Min-Jung
Kang, Hye-Young
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Article History
Received: 6 March 2017
Accepted: 9 February 2018
First Online: 19 February 2018
Compliance with ethical standards
:
: Ethical approval for the study was obtained from the institutional review board of Yonsei University (IRB no. 1040917-201606-SB-181-01E). The requirement for the acquisition of informed consent from the study population was waived by the board because the data was anonymous and cannot be personally identified.
: The authors declare that they have no conflict of interest.
