- Correspondence to: Dr W B Young Jefferson Headache Center, 111 South Eleventh Street, Suite #8130, Philadelphia, PA 19107, USA;
- Received June 20, 2006
- Accepted October 6, 2006
- Revised September 29, 2006
- First published October 20, 2006.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.