title: Muscle tenderness and psychiatric comorbidity: a vicious cycle in migraine chronicization.
authors.affiliation: Neurology Unit, Guglielmo da Saliceto Hospital , Piacenza , Italy.
authors.forename: Eugenia
authors.initials: E
authors.lastname: Rota
authors.affiliation: Headache-Facial Pain Section, Department of Clinical Pathophysiology, University of Turin , Turin , Italy.
authors.forename: Franco
authors.initials: F
authors.lastname: Mongini
keywords: chronicization; headache; migraine; muscle tenderness; tension-type headache