title: Two years in review.
authors.forename: Peg
authors.initials: P
authors.lastname: Knoll
mesh_terms: D003406:Credentialing / Q000639:trends*; D004452:Echocardiography / Q000639:trends*; D008004:Licensure / Q000639:trends*; D010506:Periodicals as Topic / Q000639:trends*; D012955:Societies, Medical / Q000639:trends*; D014481:United States