1. Department of Neurology University Hospital of LarissaSchool of MedicineUniversity of Thessaly Larissa Greece
2. Department of Neurosurgery University Hospital of LarissaSchool of MedicineUniversity of Thessaly Larissa Greece
3. Department of Microbiology University Hospital of LarissaSchool of MedicineUniversity of Thessaly Larissa Greece
4. Public Health Laboratories Hellenic Pasteur Institute Athens Greece
5. Headache Clinic Mediterraneo Hospital Glyfada Greece
6. Glyfada Headache Clinic Glyfada Greece