1. Neurology Department Headache Outpatient Clinic Saint Andrew’s State General Hospital of Patras Patras Greece
2. Euromedica General Clinic Thessaloniki Greece
3. Headache Clinic Mediterraneo Hospital Glyfada Greece
4. Glyfada Headache Clinic Glyfada Greece
5. 1st Department of Neurology Headache Outpatient Clinic National and Kapodistrian University of Athens Athens Greece