1. Postgraduate Program in Surgical Sciences Faculty of Medicine Federal University of Rio Grande do Sul Porto Alegre Brazil
2. Department of Morphological Sciences Institute of Basic Health Sciences Federal University of Rio Grande do Sul Porto Alegre Brazil
3. Neurosurgeon at Moinhos de Vento Hospital Porto Alegre Brazil
4. Radiologist and Neuroradiologist Porto Alegre Brazil
5. Neurologist at the Institute of Neurology Columbia University Medical Center New York New York