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A: Simulator doll without skin. Opening in fourth, fifth, and sixth intercostal spaces and abdominal window with lower ribcage and xiphoid process are shown. B: Simulator doll dressed in skin overlay. C: Removable backplate with infant-size 3D-printed heart, magnetically attached to a stand to hold its orientation, with a lambskin condom over the heart to act as the pericardium. D: Internal view of the 3D-printed rubber heart and needle approaching the pericardial space.
