Please feel free to read and cite any published document: Silvia Mariela Méndez Prado, smendez@espol.edu.ec ESPOL Polytechnic University, Escuela Superior Politécnica del Litoral, ESPOL, Faculty of Social Sciences and Humanities, Campus Gustavo Galindo Km 30.5 Vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador.