Funding for this research was provided by:
Received: 27 January 2018
Accepted: 26 August 2018
First Online: 6 November 2018
Ethics approval and consent to participate
: This study was approved by the institutional review board (KUH1110068).
: Not applicable.
: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.
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