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Izquierdo Gómez M, Domínguez Rojas V, Rodríguez Artalejo F, Gil Miguel A, del Rey Calero J.Izquierdo Gómez M, et al.An Esp Pediatr. 1988 Oct;29(4):314-6.An Esp Pediatr. 1988.PMID: 3266065Spanish.