WHO	World Health Organization
BP	blood pressure
SBP	systolic blood pressure
DBP	diastolic blood pressure
MAP	mean arterial pressure
ABP	arterial blood pressure
PWTT	pulse wave transit time
PWAT	pulse wave arrival time
ECG	electrocardiograph
PPG	photoglethysmography
BHS	British Hypertension Society
AAMI	US Association of Advancement of Medical Instrument
PIR	phtopleththysmograph
db8	Daubechies 8
CWT	continuous wavelet transformation
DwT	discrete wavelet transformation
ReLU	rectified linear unit
BiLSTM	bidirectional long short-term memory network
FC	fully connected network
RF	random forest
SVR	support vector regression
PCA	principle component analysis
KernelPCA	kernel PCA
MErr	mean error
MAErr	mean absolute error
RSMErr	root square mean error
CP	cumulative percentage
PSO	particle swarm optimization