Erratum to: Type-4 spinors: transmuting from Elko to single-helicity spinors C. H. Coronado Villalobos, R. J. Bueno Rogerio and E. F. M. T. São Sabbas Eur. Phys. J. C, 79 7 (2019) 587 Published online: 11 July 2019 DOI: 10.1140/epjc/s10052-019-7107-7