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The wearable device (Sensifree) for measuring arterial blood pressure (1 – wristband; 2 – radial artery; 3 – sensor; 4 – the cross-section of a wrist; 5 – the ulnar artery; 6, 7 – bones in the wrist; 8 – the thickness of the wrist band; 9 – the shortest distance between the surface of the wrist and one point along the wristband). Diagram modified from reference (84).
