Yosipovitch G, Reaney M, Mastey V, Eckert L, Abbe A, Nelson L, Clark M, Williams N, Chen Z, Ardeleanu M, Akinlade B, Graham NMH, Pirozzi G, Staudinger H, Plaum S, Radin A, Gadkari A. Peak Pruritus Numerical Rating Scale: psychometric validation and responder definition for assessing itch in moderate-to-severe atopic dermatitis. Br J Dermatol. 2019 Oct;181(4):761-9. doi: 10.1111/bjd.17744