1 Headache Center, Neurological Clinic "L. Amaducci", Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari, Bari, Italy. mariapia.prudenzano@virgilio.it.
2 Headache Center, Neurological Clinic "L. Amaducci", Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari, Bari, Italy.
3 Anaesthesia and Reanimation Clinic, Department of Emergency and Organ Transplants, University of Bari, Bari, Italy.