Funding for this research was provided by:
National Natural Science Foundation of China (31671945)
Text and Data Mining valid from 2019-04-19
Received: 19 February 2019
Accepted: 14 April 2019
First Online: 19 April 2019
Compliance with ethical standards
: The author has no conflicts of interest to disclosure.
: Informed consent was obtained from all individual participants included in the study.
: This is a review article and the article does not contain any studies with human participants or animals performed by the author.