Funding for this research was provided by:
National Natural Science Foundation of China (81672264, 81871858)
Text and Data Mining valid from 2020-03-13
Received: 8 January 2020
Accepted: 29 February 2020
First Online: 13 March 2020
Ethics approval and consent to participate
: Not applicable for this review article as no new studies were conducted or data generated.
: All authors have approved the final manuscript for publication.
: The authors declare that they have no competing interests.