A numerical estimative error of the magnitude of the vacuum polarization effect due to electron-positron by a factor of 103 in [PRL97(2006)100403; 269901(E)] invalidates the study carried in this work in its present context.
@article{arxiv.hep-ph/0609311,
title = {Probing QCD Corrections to QED Effects Through Optical Experiments in Vacuum},
author = {J. Dias de Deus and P. Castelo Ferreira and J. Tito Mendonca},
journal= {arXiv preprint arXiv:hep-ph/0609311},
year = {2007}
}