Funding for this research was provided by:
Ningxia Natural Science Foundation of China (No. 2018AAC03218)
National Natural Science Foundation of China (No.51966018)
National Natural Science Foundation of China (No.51466015)
Ningxia Higher Education & Research Project of China (No. NGY2018-259)
Article History
Received: 21 March 2020
Accepted: 28 May 2020
First Online: 6 June 2020