CGRP and PTX3 as predictors of efficacy of Onabotulinumtoxin type a in chronic migraine: an observational study - Domínguez, C; Vieites-Prado, A; Pérez-Mato, M; Sobrino, T; Rodríguez-Osorio, X; López, A (Headache: The Journal of Head and Face Pain, 2018)