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(a) Printed circuit board (PCB) developed to interface PPG probes and electrocardiography (ECG) electrodes with the analog input module. (b) NI PXIe4303 (National Instruments, Austin, TX, USA) analog input module that was used in the system. (c) LabVIEW graphical user interface (GUI) program that acquired and allowed the visualization of PPG and ECG signals.
