Comorbidity with fibromyalgia predicted poorer outcomes in patients with chronic migraine on flunarizine: Prospective proof-of-concept study. - Ling, Yu-Hsiang; Pan, Li-Ling Hope; Chen, Shih-Pin; Chen, Wei-Ta; Liu, Hung-Yu; Wang, Shuu-Jiun; Wang, Yen-Feng (Cephalalgia, 2025)