The Publisher regrets that two of the authors of this paper were listed with the incorrect affiliations. The correct details are shown below. Hernán G. Villarraga should be affiliated with AAUniversidad Regional Amazónica Ikiam, Kiloacute;metro 7 Viacute;a Muyuna, Napo, Ecuador. Gloria Salmoral should be affiliated with ABInstituto de Altos Estudios Nacionales (IAEN), Av. Amazonas N37-271 y Villalengua, Quito, Ecuador.