Assessment: Transcranial Doppler UltrasonographyNeurol 62:1468-1481, Sloan,M.A.,et al, 2004
Paradoxical Embolism as a Cause of Ischemic Stroke of Uncertain Etiology:A Transcranial Doppler Sonographic StudyStroke 25:771-775, Itoh,T.,et al, 1994