1. AARA Research Center; Dallas TX USA
2. Asthma & Allergy Associates; Colorado Springs CO USA
3. Marycliff Allergy Specialists; Spokane WA USA
4. Oregon Allergy Associates; Eugene OR USA
5. Institute for Allergy and Asthma; Chevy Chase MD USA
6. ViroPharma Incorporated (part of the Shire Group of Companies); Exton PA USA