Funding for this research was provided by:
Small and Medium Business Administration (S2392537)
Korea Health Industry Development Institute (HI16C0257)
Received: 17 May 2018
Accepted: 23 November 2018
First Online: 4 December 2018
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Yonsei University of College of Medicine (IRB-1-2017-0012). Written informed consent was obtained from all patients.
: No personal information is included in the publication; thus no dedicated approval was required.
: The authors declare that they have no competing interests.
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