Funding for this research was provided by:
National Natural Science Foundation of China (11801168, 11771199, 12071248)
Natural Science Foundation of Hunan Province (2018JJ3322)
Scientific Research Fund of Hunan Provincial Education Department (18B024)
Discovery Grants (RGPIN-2018-06466)
National Statistical Science Research Project of China (2020LZ26)
Natural Science Foundation of Shandong Province (ZR2019MA002)
Article History
Received: 31 March 2021
Revised: 18 October 2021
Accepted: 28 January 2023
First Online: 16 June 2023