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Porta-Etessam J, Berbel A, Martínez-Salio A, Balsalobre-Aznar J, Madero S, Ramos A, Vallejo AR.Porta-Etessam J, et al. Among authors: vallejo ar.Rev Neurol. 1999 Aug 1-15;29(3):287-8.Rev Neurol. 1999.PMID: 10797910Spanish.No abstract available.