1. Department of Mathematics, Computer Science and Information Systems, California University of PA, California, PA, USA
2. Infectious and Tropical Disease Institute, Department of Biomedical Sciences, Ohio University, Athens, OH, USA
3. Center for Health Research in Latin America (CISeAL), School of Biological Sciences, Pontifical Catholic University of Ecuador, Quito, Ecuador
4. Quantitative Biology Institute and Infectious and Tropical Disease Institute, Department of Mathematics, Ohio University, Athens, OH, USA