Abbreviations, acronyms & symbols
AF	= Atrial fibrillation
ApEn	= Approximate entropy
CD	= Correlation dimension
DET	= Determinism
DFA	= Detrended fluctuations analysis
ENTR	= Entropy
HRV	= Heart rate variability
LAM	= Laminarity
Lmax	= Maximum line
Lmean	= Average diagonal length
REC	= Recurrence
RPs	= Recurrence plots
RR	= RR intervals
SampEn	= Sample entropy
ShEn	= Shannon entropy
TT	= Trapping time