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→TENS Research: update
=== TENS Research ===
There is only one paper about Quell principles right on the official Quell website<ref>Science behind Quell, in: https://www.quellrelief.com/files/science-behind-quell.pdf, version 8/12/2015</ref>, but this doesn't contain necessities of independent scientific study. Although there are no other studies dealing with Quell product specifically, an independent research about transcutaneous electric nervous stimulation (TENS) was conducted. This study appear not to be unambiguous regarding good efficacy of TENS in treatment. Here follow few works engaged in TENS technology and its influence on different deseases.
Sluka and Walsh<ref>Sluka KA, Walsh D., Transcutaneous electrical nerve stimulation: basic science mechanisms and clinical effectiveness, in: Journal of Pain, 2003, p. 109-121</ref> summarize existing researches of TENS, and shows couple of results of scientific trials, and speak about equivocal effectiveness remaining due to low number of randomized and controlled trials. Sluka and Walsh quote that different trials for one disease may have contrasting results, as in case with treating labor pain.<ref>Sluka KA, Walsh D., Transcutaneous electrical nerve stimulation: basic science mechanisms and clinical effectiveness, in: Journal of Pain, 2003, p. 109-121</ref>
