| http://www.w3.org/ns/prov#value | - The inventors have discovered that obtaining the photoplethysmograph from a central source site (CSS) eliminates much of the background noise and poor signal to noise ratio found in the plethysmograph from a peripheral source site (PSS), and it is the obtention of this ???less noisy??? signal that eventually led to the realization that information such as respiration rate, pulsatile carotid blood
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