Erratum

In Bustinza et al,1 the author affiliations should have appeared in Spanish instead of English.

The author affiliation section on page 2795 should read:

¹Departamento de Ingenierí a Matemática & Centro de Investigación en Ingenierí a Matemática (CI²MA), Universidad de Concepción, Casilla 160-C, Concepción, Chile

²Escuela de Matemáticas, Universidad Nacional de Colombia, Sede Medellín, Colombia

The original online published article was updated on 07 December 2018.