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4. Probiotics to prevent urinary tract infections: the rationale and evidence;Reid;World J. Urol.,2006
5. FAO/WHO (2002) Guidelines for the Evaluation of Probiotics in Food. Joint FAO/WHO Working Group Report on Drafting Guidelines for the Evaluation of Probiotics in Food. (ftp://ftp.fao.org/es/esn/food/wgreport2.pdf)