title: Cytology proficiency testing has stumped experts.
authors.forename: R
authors.initials: R
authors.lastname: Voelker
mesh_terms: D003581:Cytodiagnosis / Q000592:standards / Q000639:trends; D003584:Cytological Techniques / Q000592:standards / Q000639:trends; D006801:Humans; D011786:Quality Control