bpm	Beats Per Minute
CI	Confidence Interval
CVD	Cardiovascular Disease
ECG	Electrocardiogram
FDA	Food and Drug Administration
ICD	Implantable Cardioverter-Defibrillators
MAE	Mean Absolute Error
PC	Personal Computer
PPG	Photoplethysmography
PR	Pulse Rate
R	Pearson Correlation
REML	Restricted Maximum Likelihood
RMSE	Root-Mean-Squared Error
ROI	Region of Interest
rPPG	Remote Photoplethysmography
SE	Standard Error