Funding for this research was provided by:
KAIST Institute for IT Convergence (2E26470-16-099)
Text and Data Mining valid from 2019-08-05
Received: 30 December 2018
Accepted: 25 July 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: We received ethical approval for the study from the Institute of Review Board at Seoul National University (Approval No. 1608/001–001); 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.