Text and Data Mining valid from 2018-12-01
Received: 26 July 2018
Accepted: 27 November 2018
First Online: 5 December 2018
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of Samsung Changwon Hospital. Informed consent was exempted by the board (IRB Number 2017–08-004). Respondents who participated signed informed consent forms.
: Not applicable.
: The authors declare that they have no competing interests.
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