1. Department of Mathematics, Government College University, Lahore 54000, Pakistan
2. Department of Mathematics, Riphah International University - Lahore Campus, Islamabad, Pakistan
3. Department of Medical Research, China Medical University, Taichung 40402, Taiwan
4. Department of Mathematics Education, Akenten Appiah Menka University of Skills Training and Entrepreneurial Development, Kumasi, Ghana
5. Party School of Shandong Provincial Committee of the Communist Party of China (Shandong Administration College), Jinan 250014, China
6. The Research Center of Theoretical System of Socialism with Chinese Characteristics in Shandong Province, Jinan 250014, China