Erratum: Mass splitting of the pseudoscalar and vector mesons induced by the homogeneous vacuum gluon field Ja.V. Burdanov, G.V. Efimov, S.N. Nedelko and S.A. SoluninEur. Phys. J. C, 7 3 (1999) 551DOI: https://doi.org/10.1007/s100520050428