CI	Confidence Interval
ELF	Extremely Low-Frequency
GRADE	Grading of Recommendations Assessment, Development and Evaluation
MCID	Minimal Clinically Important Difference
MeSH	Medical Subject Headings
PEMF	Pulsed Electromagnetic Field
PRF	Pulsed Radiofrequency
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
QoL	Quality of Life
RCT	Randomized Controlled Trial
RoB 2	Cochrane Risk of Bias tool (Version 2)
RR	Risk Ratio
SD	Standard Deviation
SMD	Standardized Mean Difference
TAU	Treatment as Usual