1. KMUTT-Fixed Point Theory and Applications Research Group & Department of Mathematics, Theoretical and Computational Science Center (TaCS), Science Laboratory Building, Faculty of Science, King Mongkut’s University of Technology Thonburi (KMUTT), Bangkok, Thailand.
2. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan.
3. Department of Mathematics Education and RINS, Gyeongsang National University, Jinju, Korea.
4. Center for General Education, China Medical University, Taichung, Taiwan.