Erratum to: K +→π + π 0 e + e −: a novel short-distance probeL. Cappiello, O. Catà, G. D’Ambrosio and Dao-Neng GaoEur. Phys. J. C, 72 11 (2012) 2208DOI: https://doi.org/10.1140/epjc/s10052-012-2208-6