Erratum to: Type-4 spinors: transmuting from Elko to single-helicity spinorsC. H. Coronado Villalobos, R. J. Bueno Rogerio and E. F. M. T. São SabbasEur. Phys. J. C, 79 7 (2019) 587DOI: https://doi.org/10.1140/epjc/s10052-019-7107-7