Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (MOST 107-2410-H-002-084-MY2)
Text and Data Mining valid from 2019-08-14
Received: 1 April 2019
Accepted: 9 August 2019
First Online: 14 August 2019
Compliance with ethical standards
: The author declares that they have no conflict of interest.