The earlier research was problematic because they didn't distinguish between two therapies - ultrasound and xenon gas.
http://www.popularmechanics.com/science/health/breakthroughs/ultrasounds-and-the-fight-against-stroke-16304982
How many hospitals would have this machine and what training is needed?
This article does mention that tPA is 20% effective with no attribution, I've been using the 12% rate.
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