The incidence of<unk>  is approximately 1.96, 1.20, 0.18, and 0.44 per 100,000 for black males, black females, white males, and white females respectively, worldwide.<unk>  affects men and women equally. There is no racial predilection to the<unk> .<unk>  usually occur in middle age group i.e. 20-40 years; the median age at diagnosis is 39 years.
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