1. Department of Radiology, University of Cagliari, 09042 Cagliari, Italy
2. Neuroscience and Physiology, Sahlgrenska Academy, 41390 Gothenburg, Sweden
3. Department of Cardiovascular Medicine, Mayo Clinic, Rochester, MN 55905, USA
4. Department of Neurologic Surgery, Mayo Clinic, Rochester, MN 55905, USA
5. Department of Vascular Surgery, University of Patras, 26504 Patras, Greece
6. Centro Cardiologico Monzino IRCCS, Via C. Parea 4, 20138 Milan, Italy
7. Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20122 Milan, Italy
8. Department of Vascular Surgery, Central Clinic of Athens, 14122 Athens, Greece
9. Department of Medical Imaging, Neuroradiology Section, Sunnybrook Health Sciences Centre, University of Toronto, Toronto, ON M4N 3M5, Canada