Detection of Patent Foramen Ovale. Transesophageal Echocardiography and Transcranial Doppler Sonography With Ultrasound Contrast Media are "Supplementary, Not Competing, Diagnostic Methods"
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Transcranial Doppler Correlation with Angiography in Detection of Intracranial Stenosis
Stroke 25:1931-1934, Rorick,M.B.,et al, 1994