1. Department of Mathematics, University of Swabi, Swabi, Khyber Pakhtunkhwa, Pakistan
2. Operational Research Center in Healthcare, Near East University, Nicosia/Mersin, Turkey + Section of Mathematics, International Telematic University Uninettuno, Roma, Italy
3. Department of Mathematics, Science Faculty, Firat University, Elazig, Turkey + Department of Medical Research, China Medical University, Taichung, Taiwan