1. Department of Mathematics, University of Malakand, Chakdara, Dir Lower, Khyber Pakhtunkhwa, Pakistan
2. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
3. Near East University, Operational Research Center in Healthcare, Nicosia 99138, TRNC Mersin 10, Turkey
4. Section of Mathematics, International Telematic University Uninettuno, Corso Vittorio Emanuele II, Roma 3900186, Italy
5. Department of Mathematic, College of Science, Taif University, P. O. Box 11099, Taif 21944, Saudi Arabia