Cerebral ischemic events associated with 'bubble study' for identification of right to left shunts.
Romero JR, Frey JL, Schwamm LH, Demaerschalk BM, Chaliki HP, Parikh G, Burke RF, Babikian VL. Cerebral ischemic events associated with 'bubble study' for identification of right to left shunts. Stroke. 2009 Jul; 40(7):2343-8.