Received: 29 June 2018
Accepted: 27 August 2018
First Online: 15 October 2018
: All of the authors have no affiliations with or involvement in any organization or entity with any financial interest or nonfinancial interest in this manuscript. This manuscript represents original works and is not being considered for publication elsewhere.
: This study was approved by the Institutional Review Board of Seoul National University Bundang Hospital (IRB No. B-1802-453-106).
: Consent for publication was obtained.
: The authors declare that they have no competing interests.
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