1. Department of Health Science, Medical School, University of Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
2. Department of Neurology and Neurosurgery, University of Caxias do Sul, Caxias do Sul, Rio Grande do Sul, Brazil
3. Department of Medical Science, Medical School, Catholic Pontifical University of Sao Paulo, Sao Paulo, Brazil,
4. Department of Neurosurgery, The Walton Centre, Liverpool, United Kingdom,
5. Department of Neurology, Division of Neurology, Catholic Pontifical University of Sorocaba, Sorocaba, Brazil.