Funding for this research was provided by:
Ministry of Science and Technology, Taiwan (NSC 100-2320-B-002-013-MY3)
Text and Data Mining valid from 2019-01-16
Accepted: 5 December 2018
First Online: 16 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.