1. Hospital de Base, São José do Rio Preto Medical School , São José do Rio Preto, 15090-000 , Brazil
2. Hospital das Clínicas, Ribeirão Preto School of Medicine, University of São Paulo , Ribeirão Preto, 14049-000 , Brazil
3. Post-Graduate Division, São José do Rio Preto Medical School , São José do Rio Preto, 15090-000 , Brazil
4. Department of Medicine, University of Ribeirão Preto , Ribeirão Preto, 14096-900 , Brazil