Funding for this research was provided by:
Department of Science and Technology of Sichuan Province (2018SZ0135 and 2018SZ0255)
Text and Data Mining valid from 2019-11-28
Received: 13 August 2019
Accepted: 31 October 2019
First Online: 28 November 2019
Consent for publication
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.