1. Department of Neurology The Ural State Medical University Yekaterinburg Russia
2. International Headache Center “Europe‐Asia” Yekaterinburg Russia
3. Medical Union “New Hospital” Yekaterinburg Russia
4. Department of Economics Ural Federal University Yekaterinburg Russia
5. Danish Headache Center Department of Neurology Rigshospitalet‐Glostrup University of Copenhagen Copenhagen Denmark