Department of Mathematics.|College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, China.|Department of Mathematics.|College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, China.|College of Information Science and Engineering, Hunan University, Changsha 410082, China.|College of Science, East China University of Technology, Nanchang 330013, China.|School of Mathematics and Information Science, Henan Polytechnic University, Jiaozuo 454000, China.|Department of Civil and Environmental Engineering, National Universality of Singapore, Singapore 117576, Singapore.|Department of Mathematics, City University of Hong Kong, Hong Kong SAR.|College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China.|Department of Mathematics.|School of Mathematics and Statistics, Hainan Normal University, Haikou 570100, China.