1. Department of Mathematics and Statistics Universidad del Norte Barranquilla Colombia
2. School of Industrial Engineering, Pontificia Universidad Católica de Valparaíso Valparaíso Chile
3. Faculty of Natural Sciences and Mathematics Escuela Superior Politécnica del Litoral ESPOL Guayaquil Ecuador
4. Faculty of Engineering Universidad Espíritu Santo Samborondón Ecuador
5. Department of Statistical Sciences University of Toronto Toronto Canada