Transcutaneous electrical nerve stimulation. From electric eels to electrodes.
D000818:Animals; D004599:Electric Stimulation Therapy / Q000266:history*; D004566:Electrodes; D004593:Electrophorus; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D010149:Postoperative Pain / Q000628:therapy; D004561:Transcutaneous Electric Nerve Stimulation / Q000266:history* / Q000295:instrumentation