- Correspondence to: Dr M K Eriksen Danish Headache Center, University of Copenhagen, Department of Neurology, Glostrup Hospital, Nordre Ringvej 57, DK-2600 Glostrup, Denmark;
- Received January 27, 2004
- Accepted May 11, 2004
- Revised April 20, 2004
- First published January 14, 2005.
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