1. Division of Interventional Radiology, Department of Radiology, Hematology and Oncology, Medical School of Ribeirão Preto, University of São Paulo, São Paulo, Brazil

2. Division of Interventional Neuroradiology, Felício Rocho Hospital, Belo Horizonte, Minas Gerais, Brazil

3. Division of Interventional Neuroradiology, Clinics Hospital, Passo Fundo, Rio Grande do Sul, Brazil