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Determination of pulse arrival time and pulse transit time in various modalities that combine photoplethysmography with biosignals for blood pressure estimation. ICG: impedance cardiography, SCG: seismocardiography, ECG: electrocardiography, GCG: gyrocardiography, IPG: impedance plethysmography, PPG: photoplethysmography, BCG: ballistocardiography, SBS: strain-based sensor, PAT: pulse arrival time, PTT: pulse transit time.
