2-AG	2-arachidonoylglycerol
AEA	Arachidonoylethanolamine/Anandamide
BDNF	Brain-derived neurotrophic factor
BMI	Body mass index
CB1; CB2 receptor	Cannabinoid receptor 1, 2
CNS	Central nervous system
DAkkS	Deutsche Akkreditierungsstelle (German Accreditation Body)
DIN	Deutsches Institut für Normung (German Institute for Standardization)
DRKS	Deutsches Register Klinischer Studien (German Clinical Trials Register)
ECLIA	Electrochemiluminescence Immunoassay
ELISA	Enzyme-Linked Immunosorbent Assay
ECS	Endocannabinoid system
EOR	End of rehabilitation
EN	Europäische Normung (European Standadization)
FAAH	Fatty acid amino hydrolase
GPS	German Pain Society („Deutsche Schmerzgesellschaft e.V.“)
GPQ ("DSF")	German Pain Questionnaire („Deutscher Schmerzfragebogen“)
HPA	Hypothalamic–pituitary–adrenal
IGF-1	Insulin-like growth factor 1
IGF-1R	Insulin-like growth factor 1 receptor
ICD	International Classification of Diseases
ISO	International Organization for Standardization
DIN EN ISO 15189	International Standard for Medical Laboratories
IL-6	Interleukin-6
IL-6R	Interleukin-6-receptor
LOCF	Last Observation Carried Forward
MHH	Medizinische Hochschule Hannover (Hannover Medical School)
MAGL	Monoacylglycerol lipase
NSAIDs	Non-steroidal anti-inflammatory drugs
NRS	Numeric rating scale
GPT	Global Performance of Treatment
Q-Q plots	Quantile-Quantile plots
SD	Standard deviation