Chen, L., Duan, X., Xing, F., Liu, G., Gong, M., Li, L., … Xiang, Z. (2019). Effects of pulsed electromagnetic field therapy on pain, stiffness and physical function in patients with knee osteoarthritis: A systematic review and meta-analysis of randomized controlled trials. Journal of Rehabilitation Medicine, 51(11), 821–827. https://doi.org/10.2340/16501977-2613