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Article History

Received: 23 May 2017

Accepted: 13 February 2018

First Online: 20 March 2018

Ethics approval and consent to participate

: This study was approved by the Institutional Review Board of Ajou University Hospital. (AJIRB-SBR-EXP-17-130).

: Not applicable.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.