title: Proliferation of ultrasound fellowships in emergency medicine: how do we ensure future experts are expertly trained?
authors.forename: Michael
authors.initials: M
authors.lastname: Blaivas
authors.forename: Daniel L
authors.initials: DL
authors.lastname: Theodoro
authors.forename: Paul
authors.initials: P
authors.lastname: Sierzenski
mesh_terms: D002983:Clinical Competence; D004635:Emergency Medicine / Q000193:education*; D005257:Fellowships and Scholarships / Q000639:trends*; D014463:Ultrasonography