1. Department of Pediatrics, Centro Hospitalar do Alto Ave, Hospital de Guimarães, 4835-044 Guimarães, Portugal
2. Department of Pediatrics, Centro Hospitalar de São João, Alameda Prof. Hernâni Monteiro, 4200-319 Porto, Portugal
3. Unit of Neuropathology, Hospital de Santo António, Centro Hospitalar do Porto, 4099-001 Porto, Portugal
4. Department of Neurology, Centro Hospitalar do Alto Ave, Hospital de Guimarães, 4835-044 Guimarães, Portugal