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→Important Dates: update
* 1965 - Melzack and Wall proposed first conceptual model for mechanism which could lead to pain relief. They rationalized that harmful signals may be inhibited by peripheral afferents of large diameter.<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272</ref>
* 1970s - Developement of TENS (Transcutaneous electrical nerve stimulation).<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272</ref>
* 2007 - Johnson and Martinson - Largest meta-analysis of evidences about three times stronger pain relief than in placebo.<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272</ref>
Important dates of Quell device history:
* 1996 - Establishment of Neurometrix.<ref>Company overview: http://www.neurometrix.com/about-neurometrix/company-overview.html, (Retrieved Dec 15, 2015)</ref>
* 2014 - FDA gives a clearance to release Quell wearable device.<ref>NeuroMetrix Begins Shipping Quell Device, June 1, 2015: http://www.fdanews.com/articles/171428 (Retrieved Dec 15, 2015)</ref>
