Quan Phan, N., Blome, C., Fritz, F., Gerss, J., Reich, A., Ebata, T., Augustin, M., Szepietowski, J. C., & Ständer, S. (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), 502–507. https://doi.org/10.2340/00015555-1246