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. 2023 Jun 11;10(6):711. doi: 10.3390/bioengineering10060711

Figure 4.

Figure 4

TENS equipment. Reproduced with permission from Johnson, M.I., Resolving Long-Standing Uncertainty about the Clinical Efficacy of Transcutaneous Electrical Nerve Stimulation (TENS) to Relieve Pain: A Comprehensive Review of Factors Influencing Outcome; published by MDPI, 2021 [90].