1. School of Mathematics and Information Science, Henan Polytechnic University, Jiaozuo 454000, P. R. China
2. Department of Mathematics, COMSATS University of Islamabad, Sahiwal Campus, Punjab, Pakistan
3. Department of Mathematics, Science Faculty, Firat University, 23119 Elâziğ, Turkey
4. Department of Medical Research, China Medical University, 40402 Taichung, Taiwan
5. Department of Mathematics, College of Science, King Khalid University, 61413 Abha, Saudi Arabia