“…VAS are commonly used measurement tools for quantifying a participant's perception of symptoms, such as pain, dyspnea, nausea, and fatigue, in research studies. Use of the VAS for symptom measurement has been extensively studied for pain measurement and fatigue in a variety of patient populations and situations, and the scale has been found to be a valid and reliable measure for symptom perception (Anton, Miller, & Townson, 2008;Bausewein, Booth, & Higginson, 2008;Bijur, Silver, & Gallagher, 2001;Bricker & Lavendre, 2002;Good et al, 2001;Hewlett, Hehir, & Kirwan, 2007;Mattsson, M˛ller, Lundberg, Gard, & Bostr˛m, 2008;Mayberry et al, 1999a;Myles & Urquhart, 2005;Vasconcelos et al, 2006;Winkelman, Norman, Maloni, & Kless, 2008).…”