| Factor Five Leiden Support: Support for sufferers of the Factor Five Leiden blood clotting disorder, an inherited blood condition discovered in 1995. History, glossary, and meeting information (Oregon). |
| Living with Factor V Leiden: Factor V Leiden is the most common hereditary blood coagulation disorder in the United States. It is present in 5% of the American population. |
| University of Illinois Patient Resources: Description of factor V Leiden, its risks and treatment options. Also discusses the impact of other conditions on this disease. |
| Yahoo! Groups: Leiden Factor V Support: Message board and chat room for people diagnosed with the Factor V Leiden genetic disorder. |