  
         
     
       "1The American Academy   of Neurology (AAN), established in 1948, is an international professional   association of more than 20,000 neurologists and neuroscience professionals   dedicated to providing the best possible care for patients with neurological   disorders." 
         
             "2The American Council   for Headache Education (ACHE) is a nonprofit patient-health professional   partnership dedicated to advancing the treatment and management of headache and   to raising the public awareness of headache as a valid, biologically based   illness." 
         
              
        "3The American Pain Society is a   multidisciplinary community that brings together a diverse groups of scientists,   clinicians and other professionals to increase the knowledge of pain and   transform public policy and clinical practice to reduce pain-related   suffering." 
         
              
        "4ClusterHeads, welcome to   your new home on the internet! This site is devoted completely and exclusively   to those that suffer from, and to the supporters of those who suffer from   Cluster Headaches!" 
          
        "5Infotrieve, Inc. is   a global provider of content management technology and information services for   the life sciences and other R&D-intensive industries that pioneer important   scientific, technical, and medical (STM) breakthroughs." 
 
                
        "6Migraine Awareness Group: A National Understanding for Migraineurs, was created to bring public awareness utilizing the   electronic, print and artistic mediums, to the fact that Migraine is a true   biologic neurological disease, to assist Migraine sufferers, their families, and   coworkers, and to help improve the quality of life of Migraine sufferers   worldwide." 
         
              
        "7The   National Headache Foundation is a non-profit organization dedicated to educating   headache sufferers and healthcare professionals about headache causes and   treatments." 
          
        1American Academy of Neurology.   (2006). About the Academy. In AAN. Retrieved   April 12, 2007, from http://www.aan.com/about/index.cfm. 
          2American Council for Headache Education.   (2004). Welcome. You are not alone. In ACHE . Retrieved April 12, 2007,   from http://www.achenet.org/. 
          3American   Pain Society. (2007). Home. In American Pain Society. Retrieved April   12, 2007, from http://www.ampainsoc.org/. 
          4DJ Johnson. (2006). Cluster Headaches Worldwide Support Group. In clusterheadaches. Retrieved April 12, 2007, from http://www.clusterheadaches.com/. 
          5Infotrieve. (2000). Infotrieve Online. In Healthworld   Online. Retrieved April 12, 2007, from http://www4.infotrieve.com/home.asp. 
          6Magnum   Inc.. (2007). Home Page. In MAGNUM. Retrieved April 12, 2007, from http://migraines.org/. 
          7National   Headache Foundation. (2005). Select Home Page. In National Headache   Foundation. Retrieved April 12, 2007, from http://www.headaches.org/. 
        
      
       
              
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