1. Department of Pure and Applied Mathematics, Mathematics Institute, Emerging Regional Centre of Excellence (ERCE) of the European Mathematical Society (EMS), African University of Science and Technology, Abuja, Nigeria
2. Center of Excellence in Theoretical and Computational Science (TaCS-CoE), Science Laboratory Building, Faculty of Science, King Mongkuts University of Technology Thonburi (KMUTT), Thung Khru, Bangkok, Thailand
3. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung Taiwan
4. Department of Mathematics, Faculty of Science and Technology, Rambhai Barni Rajabhat University, Chanthaburi, Thailand