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Baldellou Vázquez A, Pastor Mourón I, Ruiz-Echarri Zalaya MP, Fuertes Fernández-Espinar J.Baldellou Vázquez A, et al. Among authors: ruiz echarri zalaya mp.An Esp Pediatr. 1984 Jun;20(9):860-8.An Esp Pediatr. 1984.PMID: 6486580Spanish.