Opioids for breathlessness: psychological and neural factors influencing response variability.
Abdallah SJ., Faull OK., Wanigasekera V., Finnegan SL., Jensen D., Pattinson KTS.
Diminished opioid efficacy in the treatment of breathlessness is related to negative affect and anticipatory brain activity in the anterior cingulate and medial prefrontal cortex. http://bit.ly/2LXyyDo