HRV	Heart Rate Variability
ANS	Autonomic Nervous System
HR	Heart Rate
HC	Health Controls
MS	Multiple Sclerosis
NFL	Neurofilament Light Chain
PC	Pancreatic Cancer
PNN50	The proportion of NN50 divided by the total number of NN (R-R) intervals
QoL	Quality of Life
SD	Standard Deviation
SDNN	Standard Deviation Normal to Normal NN (R- R) intervals
SpO2	Blood Oxygen Saturation
tcpO2	Trans-cutaneous O2 Partial Pressure