ACT	Acceptance and commitment therapy
AE	Adverse effect
CBT	Cognitive behavioral therapy
COMT	Catechol-O-methyltransferase
CP	Chronic pain
HPA	Hypothalamic–pituitary–adrenal
IASP	International Association for the Study of Pain
MBSR	Mindfulness-based stress reduction
MOR	µ-opioid receptors
NIH	National Institutes of Health
NSAIDs	Non-steroidal anti-inflammatory drugs
OPRM1	Opioid receptor M 1
OXN	Oxycodone/naloxone
PCA	Patient-controlled analgesia
QoL	Quality of life
SES	Socio-economic status