• C-1 Esterase Deficiency - Article from eMedicine.com by Michael Elnicki MD on C-1 Esterase Deficiency also known as Hereditary angioedema (HAE).
• E-Medicine: HAE - An in dept look at hereditary angioedema beginning with an introduction, clinical features, differentials, work up, treatment, medication and follow up.
• Hereditary Angioedema - A definition along with a look at the causes, incidence and risk factors.
• Hereditary Angioedema Support Group - A non profit Organization dedicated to those families that are touched by a rare blood disease known as Hereditary Angioedema
• MedicineNet.com - Medical Dictionary - A brief article about hereditary angioedema.
• Reader Digest Health - Hereditary Angioedema, a general discussion, alternate names and resources.

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