Quality of life changes in cluster headache: Convergent validity, responsiveness, and interpretability of the Cluster Headache Quality of Life scale as a patient-reported outcome measure. - Naber WC; van Tilborg PJ; Brandt RB; Jansen JJ; Wilbrink LA; Mulleners WM; Kurt E; Leen W; Huygen FJPM; Bijlenga D; Fronczek R (Headache, 2026)