Do we need a third mechanistic descriptor for chronic pain states?

Kosek, E., Cohen, M., Baron, R., Gebhart, G. F., Mico, J. A., Rice, A. S. C., … Sluka, A. K. (2016, July 1). Do we need a third mechanistic descriptor for chronic pain states? Pain. Lippincott Williams and Wilkins. https://doi.org/10.1097/j.pain.0000000000000507