<unk>  is a worldwide disease but there are some parts of the world and some ethnic groups which<unk>  is more common.<unk>  is not common before adulthood. It is rarely diagnosed in patients younger than 10 years. In children the clinical picture is different from adult, mostly involving eyes(uveitis), skin and joints.<unk>  is believed to be more common in women compared to men.
Sarcoidosis epidemiology and demographics
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