References
- Lipton RB, Scher IA, Kolodner K et al. Migraine in the United States: epidemiology and patterns of health care use. Neurology 58, 885–894 (2002).
- Lipton RB, Stewart WF, Liberman JN. Neurology58(9 Suppl. 6), S21–S26 (2002).
Websites
- American Council for Headache Education www.achenet.org (Accessed April 2005)
- International Headache Society www.i-h-s.org (Accessed April 2005)
- Cyclic Vomiting Syndrome www.cvsaonline.org (Accessed April 2005)
- American Academy of Neurology www.aan.com (Accessed April 2005)