ECORFAN Journal-Republic of Guatemala, Volume 5, Number 9, December-2019, is a biannual Journal edited by ECORFAN-Republic of Guatemala. American Highway, Km 16, Terra Alta House, D7 Mixco House, Zone 1, Republic of Guatemala. http://www.ecorfan.org/republicofelsalvador/journal.php, journal@ecorfan.org. Responsible editor Erick Obed Martínez Herrera. ISSN: 2414-8849. Responsible for the last update of this issue ECORFAN Computer Unit. Imelda Escamilla Bouchán, PhD. Vladimir Luna Soto, PhD. American Highway, Km 16, Terra Alta House, D7 Mixco House, Zone 1, Republic of Guatemala. Date of last update December 31, 2019. The opinions expressed by the authors do not necessarily reflect the position of the publisher of the publication. The opinions expressed by the authors do not necessarily reflect the position of the publisher of the publication. It is strictly forbidden the total or partial reproduction of the contents and images of the publication without prior authorization from the Intellectual Property Registry