- Correspondence to Professor Peter J Goadsby, Headache Group—Department of Neurology, University of California, San Francisco, 1701 Divisadero Street, Suite 480, San Francisco, CA 94115, USA;
- Received December 23, 2011
- Revised February 20, 2012
- Accepted March 9, 2012
- First published April 6, 2012.
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