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Martínez JA, Hellerstein MK, Monreal I, Neese RA, Viteri FE.Martínez JA, et al. Among authors: hellerstein mk.Rev Med Univ Navarra. 1995 Jul-Sep;39(3):141-52.Rev Med Univ Navarra. 1995.PMID: 8552917Review.Spanish.