- Correspondence to Professor Natale Figura, Department of Medical, Surgical and Neurological Sciences, University of Siena and Policlinico S. Maria alle Scotte, Viale Bracci, Siena 53100, Italy;
- Received May 16, 2013
- Revised August 23, 2013
- Accepted September 5, 2013
- First published December 13, 2013.
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