Jose Baddini-Martinez1, Adriana I de Pádua2. 1. Internal Medicine, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14048-900 SP, Brazil. Electronic address: baddini@fmrp.usp.br. 2. Internal Medicine, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14048-900 SP, Brazil.