Discrepancies between Tissue Doppler Velocities on Different Echocardiography Machines: Comparing Apples to Oranges. Issue 6 (5th April 2013) - Halpern, Dan G.; Sanchez‐Ross, Monica; Joshi, Sandeep; Cantales, Deborah; Chaudhry, Farooq A.; Sherrid, Mark V.