Funding for this research was provided by:
This work was supported by the Ewha Womans University Research Grant of 2016
Article History
Received: 13 January 2017
Accepted: 21 February 2018
First Online: 27 February 2018
Ethics approval and consent to participate
: We received ethical approval for the study from the Institute of Review Board of Asan Medical Center (2014–1021); all participants were informed of the objectives, methods, and procedures of data collection. Their rights to confidentiality, anonymity, and voluntary withdrawal from study participation were explained and assured, as was the disposal of material containing personal information after the completion of the study. Written informed consent to participate was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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