Received: 17 June 2018
Accepted: 12 July 2018
First Online: 6 August 2018
: All of the authors have no affiliations with or involvement in any organization or entity with any financial interest or non-financial 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-1802-453-107).
: Consent for publication was obtained.
: The authors declare that they have no competing interests.
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