Affiliation: | 1. Department of Medicine, Medical School of Ribeir?o Preto, University of S?o Paulo, Ribeir?o Preto, SP, Brazil 2. Department of Surgery, Medical School of Ribeir?o Preto, University of S?o Paulo, Ribeir?o Preto, SP, Brazil 3. Departamento de Clínica Médica, Faculdade de Medicina de Ribeir?o Preto, Universidade de S?o Paulo, Av. Bandeirantes, 3900, Ribeir?o Preto, SP, 14049-900, Brazil
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