Comparative diagnostic agreement of a supervised machine learning model and a general-purpose, zero-shot, non-domain-adapted large language model for classifying headache disorders using structured questionnaires. - Katsuki, Masahito; Moran, Kieran; O'Connor, Siobhán; Ward, Tomás; Fuse, Yutaro; Gargari, Omid Kohandel; Romozzi, Marina; Gonzalez-Martinez, Alicia; Huerta, Miguel Á; Ha, Woo-Seok; Cheung, Jackson TS; Matsumori, Yasuhiko (Cephalalgia, 2026)