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9. A comparison between abdominal ultrasonography and computed tomography. Becker H, Pienaar GJ. S Afr Med J; 1980 Jun 28; 57(26):1073-5. PubMed ID: 7404097 [Abstract] [Full Text] [Related]
11. Body ultrasonography (second of two parts). Ferrucci JT. N Engl J Med; 1979 Mar 15; 300(11):590-602. PubMed ID: 368631 [No Abstract] [Full Text] [Related]