The incidence and prevalence of granulomatosis with polyangiitis (GPA) (formerly known as Wegener's granulomatosis) varies considerably between countries. In the US, a prevalence of 3 per 100,000 individuals has been reported, although this figure is likely to be an underestimate as the study was based on hospital discharges. Higher rates have been reported in Scandinavia, with a prevalence of 160 per million in Sweden.
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