Jorge Alfaro, Yale University, Yale School of Public Health, New haven CT, United States.

Marta Lourdes Baguer, University of Havana, Faculty of Mathematics and Computing,  Havana, Cuba. ORCID 0000-0003-1971-5076

Paula Brito, University of Porto, Faculty of Economics, Porto, Portugal. ORCID 0000-0002-2593-8818

Holger Cevallos, ESPOL, Faculty of Electricy and Computation Engineer, Guayaquil, Ecuador. ORCID 0000-0003-3171-8800

Maytée Cruz-Aponte, Puerto Rico University, Department of Mathematics-Physics, Cayey, Puerto Rico. ORCID 0000-0003-2270-2225

Sergio De los Cobos, Autonomous Metropolitan University, Iztapalapa Unit , Department of Electric Engineer, Mexico City, Mexico.

Fabrice Gamboa, Paul Sabatier University, Laboratory of Statistics and Probabilities, Toulouse, France. ORCID 0000-0001-9779-4393

Ellina Grigorieva, Texas Woman's University, Department of Mathematics and Computer Science, Denton TX, United States. ORCID 0000-0002-1321-6869

David Krumm, Reed College, Mathematics Department, Oregon, United States. ORCID 0000-0001-9999-2166

Humberto Llinás, University of the North, Department of Mathematics and Statistic, Barranquilla, Colombia. ORCID 0000-0002-2976-5109

Emilio Lluís Puebla, National Autonomous University of Mexico, Department of Mathematics, Faculty of Science, Mexico City, Mexico.

Clément Marteau, University of Lyon, Institute Camille Jordan, Villeurbanne, France. ORCID 0000-0003-2938-2930

Adolfo Minjárez Sosa, University of Sonora, Department of Mathematics, Hermosillo, Mexico. ORCID 0000-0002-3453-4508

Roberto Molina-Cruz, Galileo University, Guatemala City, Guatemala. ORCID 0000-0001-9636-2775

Alf Onshuus, Los Andes University, Department of Mathematics, Bogotá, Colombia. ORCID 0000-0001-7593-1553

Alexey Sadovski, Texas A&M University, Department of Computing and Mathematical Sciences, Corpus Christi TX, United States.

Michel Théra, University of Limoges, Faculty of Science and Techniques, Limoges, France. ORCID 0000-0001-9022-6406

Luis Manuel Tovar, Polytechnic National Institute, School Higher in Physics and Mathematics, Mexico City, Mexico. ORCID 0000-0003-3099-9452

Fredy Vides, National Autonomous University of Honduras, Department of Applied Mathematics, Tegucigalpa, Honduras. ORCID 0000-0003-0029-7273