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Authors
Choi, Se Young https://orcid.org/0000-0002-4615-0966
Ryu, Jeman
You, Dalsan
Jeong, In Gab
Hong, Jun Hyuk
Ahn, Hanjong
Kim, Choung-Soo https://orcid.org/0000-0002-7464-3207
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Funding
Funding for this research was provided by:
Korea Health Industry Development Institute (HI15C0972)
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Article History
Received: 15 October 2017
Accepted: 18 December 2017
First Online: 7 February 2018
Compliance with ethical standards
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: All authors declare that they have no conflict of interest.
: The study protocol was approved by the Institutional Review Board of the Asan Medical Center (2017-0129). All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board of the Asan Medical Center and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The Institutional Review Board of the Asan Medical Center waived the requirement for informed consent because of the retrospective design of this study.
