<unk>  most commonly first presents between the ages of 20 and 50 years, although any age group can be affected. Women are four to nine times more likely to develop<unk>  than men. This disease is found worldwide. In the United States, prevalence is estimated at 240 per million and the annual incidence of<unk>  is 19 per million people. Likewise in the United States, it is slightly more common in African Americans than in their White counterparts. Choctaw Native Americans are more likely than Americans of European descent to develop the type of<unk>  that affects internal organs. In Germany, the prevalence is between 10 and 150 per million people, and the annual incidence is between three and 28 per million people. In South Australia, the annual incidence is 23 per million people, and the prevalence 233 per million people.<unk>  is less common in the Asian population.
Scleroderma
Mixed connective tissue disease
Chyloderma
Dermatomyositis
Anetoderma
Polymyositis
Xeroderma
Lupus