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The American Autoimmune Related Diseases Association, Inc. (AARDA), was founded in 1991. AARDA is the only national nonprofit health agency dedicated to bringing a national focus to autoimmunity, the major cause of serious chronic diseases. Approximately 50 million Americans, 20 percent of the population or one in five people, suffer from autoimmune diseases. Women are more likely than men to be affected; some estimates say that 75 percent of those affected - some 30 million people - are women. Still, with these statistics, autoimmunity is rarely discussed as a women's health issue. AARDA provides patients with information and referrals through its national toll-free patient information line and on its website.