1. Department of Neurosciences, Mental Health & Sensory Organs (NESMOS), Sapienza University of Rome, Rome, Italy
2. Laboratory of Clinical Chemistry, Sant’Andrea Hospital, Rome, Italy
3. Department of Clinical & Molecular Medicine, Sapienza University of Rome, Rome, Italy
4. Regional Referral Headache Centre, Sant’Andrea Hospital, Rome, Italy
5. Department of Clinical Pathology, University of Sassari, Sassari, Italy