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Esteban E, González de Sande L, Fernández Y, Corral N, Fra J, Muñiz I, Vieitez JM, Palacio I, Fernández JL, Estrada E, Lacave AJ; Grupo Oncológico del Norte de España.Esteban E, et al. Among authors: fernandez jl, fernandez y.Ann Oncol. 2003 Nov;14(11):1640-7. doi: 10.1093/annonc/mdg456.Ann Oncol. 2003.PMID: 14581272Free article.Clinical Trial.