1. KMUTTFixed Point Research Laboratory, Department of Mathematics, Faculty of Science, King Mongkut's University of Technology Thonburi (KMUTT), Thung Khru, Bangkok, Thailand
2. Fakultät für Mathematik, Universität Wien, Wien, Austria
3. Center of Excellence in Theoretical and Computational Science (TaCS-CoE), Faculty of Science, King Mongkut's University of Technology Thonburi (KMUTT), Thung Khru, Bangkok, Thailand
4. Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan