title: [New series: ultrasonic diagnosis before year 2000].
authors.affiliation: Röntgenavdelningen, Huddinge sjukhus, Stockholm.
authors.forename: P
authors.initials: P
authors.lastname: Aspelin
mesh_terms: D002983:Clinical Competence; D004502:Education, Medical, Continuing; D006801:Humans; D014463:Ultrasonography / Q000379:methods / Q000639:trends*