1. Department of Family Medicine and Infectious Diseases, University of Warmia and Mazury, Olsztyn, Poland
2. Department of Otolaryngology, University of Malta, Msida, Malta
3. Department of Neurology and Restorative Medicine, Health Institute dr Boczarska-Jedynak, Oświęcim, Poland
4. Department of Otorhinolaryngology, National Institute of Medicine of the Ministry of the Interior and Administration, Warsaw, Poland
5. Department of Otolaryngology, Centre of Postgraduate Medical Education, Warsaw, Poland
6. Department of Neurology, Jagiellonian University Medical College, Kraków, Poland
7. MIGRE Polish Migraine Center, Poland
8. Department of Otolaryngology, Head and Neck Surgery and Laryngological Oncology, Bydgoszcz, Poland
9. Athleticomed—Pain&Headache Treatment Centre, Bydgoszcz, Poland
10. Department of Otorhinolaryngology, Nottingham University Hospital, Nottingham, UK
11. Department of Experimental Dentistry, Wroclaw Medical University, Wroclaw, Poland
12. Pain Medicine, Liverpool University Hospitals NHS Foundation Trust, Liverpool, UK
13. Department of Neurology, Wroclaw Medical University, Wroclaw, Poland