Gruther, W., Zorn, C., Paternostro-Sluga, T., Quittan, M., Spiss, C., Kainberger, F., … Fialka-Moser, V. (2010). Effects of neuromuscular electrical stimulation on muscle layer thickness of knee extensor muscles in intensive care unit patients: a pilot study. Journal of Rehabilitation Medicine, 42(6), 593–597. https://doi.org/10.2340/16501977-0564