1. Key Laboratory of Computing and Stochastic Mathematics (LCSM), School of Mathematics and Statistics, Hunan Normal University, Changsha, Hunan, China.
2. Corresponding author and cofirst author. Key Laboratory of Computing and Stochastic Mathematics (LCSM), School of Mathematics and Statistics, Hunan Normal University, Changsha, Hunan, China.
3. Department of Mathematics, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, China; Hong Kong Centre for Cerebro-Cardiovascular Health Engineering, Hong Kong.
4. The Department of Mathematics, The Chinese University of Hong Kong, Shatin, Hong Kong, China.