4Adedoyin RA, Olaogun MOB, Oyeyemi AL. Transcutaneous electrical nerve stimulation and interferential current combined with exercise for the treatment of knee osteoarthritis:a randomised controlled trial.Hong Kong Physiotherapy Journal. 2005;23:12-19.
5Fuentes C J, Armijo-Olivo S, Magee D J, et al. Does amplitude- modulated frequency have a role in the hypoalgesic response of interferential current on pressure pain sensitivity in healthy subjects? A randomised crossover study. Physiotherapy. 2016; 96(1):22-29.
6Watson T. The role of electrotherapy in contemporary physiotherapy practice. Man Ther. 2000;5(3):132-141.
7Poitras S, Brosseau L. Evidence-informed management of chronic low back pain with transcutaneous electrical nerve stimulation, interferential current, electrical muscle stimulation, ultrasound, and thermotherapy. Spine J. 2008;8(1 ):226-233.
