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Espín Ríos I, García-Fulgueíras A, Navarro Alonso JA, Vazquez Moreno J, Rodriguez Gonzalez T, Navarro Sánchez C, Pérez-Flores D.Espín Ríos I, et al. Among authors: navarro alonso ja, navarro sanchez c.Vaccine. 2000 Jun 1;18(24):2656-60. doi: 10.1016/s0264-410x(00)00062-1.Vaccine. 2000.PMID: 10781851Clinical Trial.