Funding for this research was provided by:
Ministry of Education (2015R1D1A1A01058225)
Ministry of Health and Welfare (HI15C1632, HI14C1867)
Received: 26 June 2017
Accepted: 12 February 2018
First Online: 27 February 2018
Ethics approval and consent to participate
: All procedures in this study were approved by the Institutional Review Boards of Seoul National University Hospital (IRBY-H-0905-041-281) and Institutional Review Boards of Seoul National University Bundang Hospital (IRB-B-1007-105-402). Written informed consent was obtained from all participants.
: No individual patient data has been reported in the current study and consent for publication is not applicable.
: The authors declare that they have no competing interests.
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