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de Ulibarri Pérez JI, Picón César MJ, García Benavent E, Mancha Alvarez-Estrada A.de Ulibarri Pérez JI, et al.Nutr Hosp. 2002 May-Jun;17(3):139-46.Nutr Hosp. 2002.PMID: 12149813Review.Spanish.