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Both techniques were found to be more accurate than the auscultatory Korotkoff-based technique, the gold-reference, in those examinations where large discrepancies were found between them, since the PPG and Korotkoff-based electronic pulses appeared before Korotkoff sounds were heard. The PPG signal in the free hand, that served as a time-reference signal, enabled both electronic techniques to eliminate artefacts - noise pulses that appeared outside the time intervals in which a blood-pressure-related pulses should appear. Significance
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