The incidence and prevalence of<unk><unk><unk>  is difficult to estimate. All the data is derived from patients receiving home parenteral nutrition. Therefore, there are different distributions around the world. The incidence of<unk><unk><unk>  was estimated to be 1-2 cases per 100,000 individuals worldwide per year. The prevalence of<unk><unk><unk>  is approximately 0.3-4 per 100,000 individuals in the USA to 0.1-4 per 100,000 individuals in Europe. It affects all age groups. There is no racial predilection to<unk><unk><unk>  and is reported worldwide.<unk><unk><unk>  affects men and women equally.
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