title: Effect of classification on the incidence of polyarteritis nodosa and microscopic polyangiitis: comment on the article by Watts et al.
authors.forename: I N
authors.initials: IN
authors.lastname: Bruce
authors.forename: A L
authors.initials: AL
authors.lastname: Bell
mesh_terms: D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D010488:Polyarteritis Nodosa / Q000145:classification* / Q000453:epidemiology*; D014657:Vasculitis / Q000145:classification* / Q000453:epidemiology*