Funding for this research was provided by:
National Natural Science Foundation of China (21606091)
the Science and Technology Planning Project of Guangdong Province in China (2015B020215011, 2017B020238005, 2019B110209003)
the National Science and Technology Support Project of China (2015BAD21B03, 2015BAD15B03)
Text and Data Mining valid from 2019-09-23
Received: 17 July 2019
Accepted: 7 September 2019
First Online: 23 September 2019
Ethics approval and consent to participate
: Not applicable.
: All the authors consented to the publication of this work.
: The authors declare that they have no competing interests.