1. School of Mathematical Sciences, Zhejiang Normal University, Jinhua, People's Republic of China
2. Department of Mathematical Sciences, Indian Institute of Technology (BHU), Varanasi, India
3. Research Center for Interneural Computing, China Medical University, Taichung, Taiwan
4. Academy of Romanian Scientists, Bucharest, Romania
5. School of Mathematical Sciences, Tiangong University, Tianjin, People's Republic of China