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El-Koussy M, Schroth G, Brekenfeld C, Arnold M.El-Koussy M, et al. Among authors: brekenfeld c.Eur Neurol. 2014;72(5-6):309-16. doi: 10.1159/000362719. Epub 2014 Oct 14.Eur Neurol. 2014.PMID: 25323674Review.