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Article History

Received: 23 November 2017

Accepted: 14 February 2018

First Online: 9 March 2018

Ethics approval and consent to participate

: The study was approved by the Institutional Review Board of the Asan Medical Center (Seoul, Korea IRB number 2017-0600), and all patients provided their informed consent.

: Not applicable

: The authors declare that they have no competing interests.

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