 In electroacupuncture, an electric current is applied to the needles once they are inserted, to further stimulate the respective acupuncture points.A 2013 editorial by Steven P. Novella and David Colquhoun found that the inconsistency of results of acupuncture studies (i.e.acupuncture relieved pain in some conditions but had no effect in other very similar conditions) suggests false positive results, which may be caused by factors like biased study designs, poor blinding, and the classification of electrified needles (a type of TENS) as a form of acupuncture.