1. Department of Mathematics, Shantou University, 515063, Shantou , GuangDong, China
2. Mathematical Institute of the Serbian Academy of Sciences, Knez Mihailova 36/III, 11000 Beograd , Serbia
3. Operator Theory and Applications Research Group, Department of Mathematics, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia