I had a feeling you'd jump on this one particular stat Phil, as we've had this discussion before. I don't just pull numbers out of a hat, the 30 - 40,000 is a number that kept coming up when I was doing the initial research on Wegener's.
Here are some links to studies and info that I have not personally authored. The numbers come out to somewhere in the 1 in 30 to 40,000 overall, but if you look at it from a yearly incidence rate it's much much higher than one in 40,000
Prevalence and incidence of Wegener's granul... [Arthritis Rheum. 2009] - PubMed - NCBI
The epidemiology of Wegener's granulomatosis... [Arthritis Rheum. 1996] - PubMed - NCBI
http://rheumatology.oxfordjournals.o...35/2/142.short
Full Text: Diagnosis of Wegener's Granulomatosis in the ANCA Era
Wegener's Granulomatosis | Doctor | Patient UK
Prevalence and Incidence of Wegener's granulomatosis - RightDiagnosis.com
Wegener's Granulomatosis: Incidence
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