PPG	photopletysmography
rPPG	remote Photopletysmography
MAE	mean average error
NN	neural network
BP	blood pressure
ECG	electrocardiogram
ML	machine learning
LSTM	long short-term memory
PTT	pulse transit time
PAT	pulse arrival time
PWV	pulse wave velocity
CNN	convolutional neural network
SBP	systolic blood pressure
DBP	diastolic blood pressure
SNR	signa-to-noise ratio