1. Department of Medicine, University Center of Maceio, Maceio, Alagoas, Brazil
2. Department of Medicine, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil
3. Department of Medicine, University Center CESMAC, Maceió, Alagoas, Brazil
4. Department of Neurosurgery, University of São Paulo, São Paulo, São Paulo, Brazil
5. Department of Neurosurgery, State University of Ponta Grossa, Ponta Grossa, Paraná, Brazil