Funding for this research was provided by:
Korea National Institute of Health (H18C1178)
Received: 20 September 2018
Revised: 20 November 2018
Accepted: 3 December 2018
First Online: 29 December 2018
Ethics approval and consent to participate
: This study was approved by the IRB of the Catholic University of Korea (IRB Number: KC13TISI0775). Written informed consent was obtained from all participants involved in this study.
: Not applicable.
: The authors declare that they have no competing interests.
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