SCS	Spinal cord stimulation
IDD	Intrathecal drug delivery
NRS	Numeric Rating Scale
BMI	Body Mass Index
SF-12	Short Form 12 (mental [MCS-12] and physical [PCS-12])
HRQoL	Health-Related Quality of Life
BPI-SF	Brief Pain Inventory Short Form
EQ-5D-5L	European Quality of Life-5 Dimensions
PGI-I	Patient Global Impression of Improvement
EQ-5D VAS	Visual Analogic Scale of the EQ-5D questionnaire
PLBP	Persistent Low Back Pain
CRPS	Complex Regional Pain Syndrome