Funding for this research was provided by:
National Natural Science Foundation of China (11201368, 11631012, 11571272)
Natural Science Foundation of Shaanxi Province (2019JM-273)
Received: 28 April 2019
Accepted: 19 August 2019
First Online: 6 September 2019
Ethics approval and consent to participate
: Not applicable. Because all of the data are downloaded from reference [CitationRef removed] (ExternalRef removed) and reference [CitationRef removed] (ExternalRef removed).
: Not applicable.
: The authors declare that they have no competing interests.