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(a,b) Seismocardiography (SCG) recorder system placement for measuring heartbeat signal and motion signals, respectively. (c) A pair of electrocardiogram (ECG) lead I electrodes placement and SCG recorder system placement. (d) An image of the SCG recorder system which shows the dimensions. X-axis, y-axis and z-axis describe the head to foot, shoulder to shoulder and dorsoventral direction, respectively.
