How Pain Works
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- Definitions and Types of Pain. (n.d.) StopPain.org. Retrieved on February 20, 2016 from http://www.healingchronicpain.org/introduction/definitions
- Classification of Pain. (n.d.) University of Wisconsin. Retrieved on February 20, 2016 from http://projects.hsl.wisc.edu/GME/PainManagement/session2.4.html