Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 106-2511-S-009-004- and MOST 107-2511-H-009-006-MY2)
Text and Data Mining valid from 2020-02-26
Received: 29 April 2019
Accepted: 23 January 2020
First Online: 26 February 2020
: The authors declare that they have no competing interests.