Martikainen, Ilkka K <br/><br/>
Alterations in endogenous opioid functional measures in chronic back pain.  [electronic resource] 

 -  The Journal of neuroscience : the official journal of the Society for Neuroscience  Sep 2013 
 - 14729-37 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't 
<br/><br/><label>ISSN: </label>1529-2401 
<br/><br/><label>Standard No.: </label>10.1523/JNEUROSCI.1400-13.2013  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Analgesics, Opioid--metabolism<br/>Analysis of Variance<br/>Back Pain--diagnostic imaging<br/>Brain--diagnostic imaging<br/>Brain Mapping<br/>Carbon Radioisotopes<br/>Case-Control Studies<br/>Chronic Disease<br/>Female<br/>Fentanyl--analogs & derivatives<br/>Humans<br/>Magnetic Resonance Imaging<br/>Male<br/>Middle Aged<br/>Pain Measurement<br/>Pain Threshold--drug effects<br/>Positron-Emission Tomography<br/>Synaptic Transmission--drug effects