Funding for this research was provided by:
National Natural Science Foundation of China (81873806)
Text and Data Mining valid from 2018-11-23
Received: 13 June 2018
Accepted: 20 November 2018
First Online: 23 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: No patients were involved in the design, conduct or interpretation of our review.