1. Institute of Mathematics, Khwaja Fareed University of Engineering & Information Technology, Rahim Yar Khan, Pakistan
2. Department of Mathematics and Sciences, Prince Sultan University, Riyadh, Saudi Arabia
3. Department of Medical Research, China Medical University, Taichung, Taiwan
4. Department of Mathematics and Applied Mathematics, Sefako Makgatho Health Sciences University, Garankuwa, Medusa, South Africa