- Correspondence to Professor Renzo Guerrini, Neurology and Neurogenetics Unit, Children's Hospital A. Meyer-University of Florence, Viale Pieraccini 24, Firenze 50139, Italy;
- Received December 17, 2014
- Revised February 17, 2015
- Accepted February 18, 2015
- First published March 9, 2015.
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