Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (105-2221-E-242-002)
Text and Data Mining valid from 2019-10-19
Received: 6 July 2019
Accepted: 11 October 2019
First Online: 19 October 2019
Ethics approval and consent to participate
: Not applicable.
: All authors consented to the publication of this work.
: The authors declare that they have no competing interests.