EndorphinsPalliative Carebeta-EndorphinNaloxonebeta-LipotropinEnkephalinsReceptors, OpioidPainAdrenocorticotropic HormonePain ManagementChronic PainTerminal CarePain ThresholdPain, PostoperativePain, IntractablePain MeasurementLow Back PainBack PainTerminally IllAbdominal PainNeck PainHospice CarePelvic PainPain Perception