- National Center for Health Statistics, over 12 million cases of Contraindications, Documented hypersensitivity; hepatic impairment.www.emedicine.com/emerg/topic69.htm
- Asthma and Allergy Statistics, NIAID Fact Sheet; Ziagen Consumer Information. Q&A from our Ask The Doctor Forums: Carotid Artery Hypersensitivitywww.medhelp.org/HealthTopics/Hypersensitivity.html