Funding for this research was provided by:
National Health Research Institutes (PH-106-PP-18)
Received: 5 September 2017
Accepted: 24 January 2018
First Online: 22 February 2018
Ethics approval and consent to participate
: The survey was approved by the Institutional Review Board of the National Health Research Institutes, Taiwan (IRB number: EC1051201-E).
: Not applicable.
: The authors declare that they have no competing interests.
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