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Soto-Hernández JL, Ramírez-Crescencio MA, Reyes-Ramírez G, Sánchez-Ramos A, Hernández-Velásquez M, Angeles Morales V, Amaya-Guerrero I.Soto-Hernández JL, et al.Gac Med Mex. 2002 Sep-Oct;138(5):397-404.Gac Med Mex. 2002.PMID: 12404723Spanish.