- Correspondence to Dr Giuseppe Lauria, Headache and Neuroalgology Unit & ALS Clinic, IRCCS Foundation, Carlo Besta Neurological Institute, Via Celoria, 11, Milan 20133, Italy;
- Received December 7, 2013
- Revised January 17, 2014
- Accepted January 29, 2014
- First published March 3, 2014.
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