Funding for this research was provided by:
National Natural Science Foundation of China (61803247)
Young Scientists Fund (61802243)
National Natural Science Foundation of China (61273311, 61173094)
Project Funded by China Postdoctoral Science Foundation (2018M640948)
Fundamental Research Funds for the Central Universities (GK201903003)
Shaanxi Postdoctoral Science Foundation (2018BSHEDZZ129)
Article History
Received: 14 March 2019
Revised: 24 July 2019
Accepted: 26 July 2019
First Online: 1 August 2019