Comparison of a Custom Functional Near-infrared Spectroscopy Sensor, a Peripheral SpO2 Sensor, and a Standard Laboratory Sensor (Biopac) for RR-Interval Assessment. - Bethany K. Bracken; Polemnia G. Amazeen; Aaron D. Likens; Mustafa Demir; Cameron T. Gibbons (BIOSIGNALS, 2018)