- Correspondence to Dr Sandra Bracco, Unit of Neuroimaging and Neurointervention, AOUS, Policlinico “Santa Maria alle Scotte”, Viale Mario Bracci, 16 - 53100 Siena, Italy;
- Received February 13, 2013
- Revised June 10, 2013
- Accepted June 17, 2013
- First published July 12, 2013.
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