1. Stroke Unit, Department of Neurology, Centro Hospitalar e Universitario de Coimbra, Coimbra, Portugal
2. Stroke Unit, Department of Neurology, Hospital Universitari Vall dHebron, Barcelona, Spain
3. Department of Interventional Neuroradiology, Hospital Universitari Vall dHebron, Barcelona, Spain
4. Department of Neuroradiology, Centro Hospitalar e Universitario de Coimbra, Coimbra, Portugal