1. School of Mechanical Engineering, Hangzhou Dianzi University, Er Hao Da Jie 1158, Xiasha, Hangzhou 310018, China
2. Center for Applied Mathematics and Bioinformatics, Gulf University for Science and Technology, West Mishref 32093, Kuwait
3. Section of Mathematics, Department of Civil Engineering, Democritus University of Thrace, 671 00 Xanthi, Greece