1. Division of Bone and Connective Tissue, Department of Surgical Oncology National Cancer Institute Rio de Janeiro Brazil
2. Postgraduation Program in Neurology Federal University of the State of Rio de Janeiro Rio de Janeiro Brazil
3. Division of Internal Medicine State University of Rio de Janeiro Rio de Janeiro Brazil
4. Division of Pathology National Cancer Institute Rio de Janeiro Brazil
5. Division of Neurosurgery Federal University of Rio de Janeiro Rio de Janeiro Brazil
6. Division of Neurosurgery Fluminense Federal University Niterói, Rio de Janeiro Brazil