B2B	Beat-to-beat
BIC	Bayesian information criterion
bpm	Breaths per minute
CVD	Cardiovascular disease
ECG	Electrocardiogram
EDR	Electrocardiogram-derived respiration
FFT	Fast Fourier transform
ICG	Impedance cardiography
ICS	Intercostal space
LVET	Left ventricular ejection time
MDPI	Multidisciplinary Digital Publishing Institute
MAE	Mean absolute error
MAPE	Mean absolute percentage error
MARG	Magnetic, angular rate, and gravity
ME	Mean error
MERS	Middle East respiratory syndrome
MLP	Multi-layer perceptron
NMSE	Normalized mean squared error
PCA	Principal component analysis
PCB	Printed circuit boards
PCG	Phonocardiogram
PDR	Phonocardiogram-derived respiration
PEP	Pre-ejection period
PPG	Photoplethysmogram
RR	Respiratory rate
SARS	Severe acute respiratory syndrome
SCG	Seismocardiogram
SSE	Sum of squared errors
STI	Systolic time intervals
TDNN	Time-delay neural network