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. Author manuscript; available in PMC: 2013 Jul 1.
Published in final edited form as: Ann Thorac Surg. 2012 May 22;94(1):59–65. doi: 10.1016/j.athoracsur.2012.02.074

Fig 2.

Fig 2

Biaxial calibration apparatus with a schematic representation of what forces are applied to the device.