Gruther, Wolfgang, Thomas Benesch, Carina Zorn, Tatjana Paternostro-Sluga, Michael Quittan, Veronika Fialka-Moser, Christian Spiss, Franz Kainberger, and Richard Crevenna. 2008. “Muscle Wasting in Intensive Care Patients: Ultrasound Observation of the M. Quadriceps Femoris Muscle Layer”. Journal of Rehabilitation Medicine 40 (3):185-89. https://doi.org/10.2340/16501977-0139.