1. School of Mathematical Sciences, Jiangsu University, Zhenjiang, People's Republic of China
2. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
3. University of Massachusetts Chan Medical School (UMASS), Worcester, MA, USA
4. Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
5. Department of Mathematics, Texas A&M University-Kingsville, Kingsville, TX, USA
6. Institute of Mathematics and Computer Science, University of São Paulo, São Carlos, Brazil
7. Department of Biosystems Engineering, University of São Paulo, Pirassununga, Brazil