title: Are Henoch-Schönlein purpura and hypersensitivity vasculitis in adults truly distinct entities? A dermatologist's perspective.
authors.forename: J P
authors.initials: JP
authors.lastname: Callen
mesh_terms: D003880:Dermatology / Q000379:methods*; D006801:Humans; D011695:IgA Vasculitis / Q000145:classification*; D018366:Vasculitis, Leukocytoclastic, Cutaneous / Q000145:classification*