DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Chang-Chien CS, Lin HH, Yen CL. et al.
Sonographic demonstration of free air in perforated peptic ulcers: comparison of sonography with radiography.
J Clin Ultrasound 1989; 17: 95-100
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