Paradoxical Embolism as a Cause of Ischemic Stroke of Uncertain Etiology:A Transcranial Doppler Sonographic Study
Stroke 25:771-775, Itoh,T.,et al, 1994
Patent Foramen Ovale as a Risk Factor for Cryptogenic Stroke
Ann Int Med 117:461-465, DiTullio,M.,et al, 1992