PPG	Photoplethysmography
PE	Photoemitter
PD	Photodetector
CCC	Cardiac Cycle Component
BC	Basal Component
ADC	Analog-to-Digital Converter
BMI	Body Mass Index
SE	Spectral Entropy
PCC	Pearson Correlation Coefficient
CS	Cosine Similarity
nED	Normalized Euclidean Distance
BPM	Beats per Minute
mSE	mean Spectral Entropy
HR	Heart Rate