title: Subspecialization and certification in radiology.
authors.affiliation: Magnetic Resonance Science Center, University of California, San Francisco 94143-0292.
authors.forename: A R
authors.initials: AR
authors.lastname: Margulis
mesh_terms: D002568:Certification / Q000639:trends*; D006801:Humans; D008511:Medicine / Q000639:trends*; D011871:Radiology / Q000145:classification / Q000639:trends*; D013038:Specialization; D014481:United States