1. Research Techniques Made Simple: Itch Measurement in Clinical Trials
Stephen Erickson, Brian S. Kim 
Journal of Investigative Dermatology 
Volume 139, Issue 2, Pages e1 (February 2019)
DOI: /j.jid
Copyright © 2018 The Authors Terms and Conditions

2. Figure 1
Numerical rating scale, verbal rating scale, and visual analogue scale.
Journal of Investigative Dermatology  , e1DOI: ( /j.jid )
Copyright © 2018 The Authors Terms and Conditions

3. Figure 2
ItchyQuant, an illustrated numeric rating scale for itch severity.
Reprinted from Haydek et al. (2017).
Journal of Investigative Dermatology  , e1DOI: ( /j.jid )
Copyright © 2018 The Authors Terms and Conditions