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Figure 2: The installation of the sensors. (a) The operation photograph of the acceleration sensor installation. The sensor was glued to a metal block that was mounted on the pelvis via screws. (b) The operation photograph of the pressure sensor installation. The laparotomy was done, and the sensor was placed under the liver. (c) The photograph of the pressure sensor. The sensor was inserted into a balloon filled with liquid. (d) The X-ray photograph, in which the sensors were indicated with arrows.