DOI: 10.1055/s-00000028

International Journal of Sports Medicine

References

Stoddard MF, Keedy DL, Dawkins PR.
The cough test is superior to the Valsalva maneuver in the delineation of right-to-left shunting through a patent foramen ovale during contrast transesophageal echocardiography. 
Am Heart J 1993; 125: 185-189  

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