1. Department of Neuroradiology, Hospital São José, Centro Hospitalar Lisboa Central, Rua José António Serrano, Lisbon 110, Portugal.
2. NOVA Medical School, Lisbon, Portugal.
3. Department of Neuroradiology, Karolinska University Hospital, Stockholm, Sweden.
4. Department of Pediatric Radiology, Astrid Lindgren Children's Hospital, Stockholm, Sweden.
5. Department of Neurosciences and Mental Health, Hospital de Santa Maria, Centro Hospitalar Lisboa Norte, Lisbon, Portugal.
6. Faculty of Medicine, University of Lisbon, Portugal.