Efficacy of mindfulness added to treatment as usual in patients with chronic migraine and medication overuse headache: a phase-III single-blind randomized-controlled trial (the MIN... oleh Licia Grazzi, Domenico D’Amico, Erika Guastafierro, Greta Demichelis, Alessandra Erbetta, Davide Fedeli, Anna Nigri, Emilio Ciusani, Corso Barbara, Alberto Raggi