1Gastro-Hepatology Unit University Hospital of Bahia Bahia, Brazil 2INSERM U.271 Lyon, France Reprint requests and correspondence: R Paraná, Av. Juracy Magalhaes Jr 2096 sala 510, Salvador BA, 41920.000, Brazil Received Sep. 15, 1998; accepted Sep. 21, 1998.
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Paraná et al. (1999) studied this question.
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