1. Department of Biochemistry, Laboratory of Cellular Neurochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre RS, Brazil
2. Department of Biochemistry, Laboratory of Cellular Biochemistry, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre RS, Brazil
3. Department of Neurosurgery, Cristo Redentor Hospital - GHC – Porto Alegre RS, Brazil
4. Department of Neurosurgery, São José Hospital, Complexo Hospitalar Santa Casa, Porto Alegre RS, Brazil