“…Finally, no attempt was made in this study to validate the VAS rating with some independent measure of treatment satisfaction, which means that artifacts cannot entirely be excluded. However, during the development of the VAS scale, it has been validated against independent satisfaction measures in a large population of migraineurs 17 and, in the present study, there was good concordance between the VAS rating and the HAS criteria for treatment response. In this context, further studies could perhaps be useful to characterize more robustly the psychometric properties of this scale, perhaps looking at long‐term variation in scale metrics, using multimodal assessments, externally validated methods, and a priori identified criterions of performance.…”