title: Introduction to continuing special series.
authors.affiliation: Institute of Pathology, Medical University of Graz, Styria, Austria. helmut.popper@meduni-graz.at
authors.forename: Helmut H
authors.initials: HH
authors.lastname: Popper
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D010338:Pathology, Clinical / Q000379:methods*; D012704:Serous Membrane / Q000473:pathology*