Quan Phan, N. (2011) “Assessment of Pruritus Intensity: Prospective Study on Validity and Reliability of the Visual Analogue Scale, Numerical Rating Scale and Verbal Rating Scale in 471 Patients with Chronic Pruritus”, Acta Dermato-Venereologica, 92(5), pp. 502–507. doi: 10.2340/00015555-1246.