Received: 7 October 2018
Accepted: 10 February 2019
First Online: 8 March 2019
Ethics approval and consent to participate
: Written informed consent was obtained from participants.Ethical approval was obtained from the Institutional Review Board (IRB) of Soonchunhyang University Hospital in Seoul (IRB number: Medicine 2018–06).
: Not applicable.
: The authors declare that they have no competing interests.
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