1. Neurology Clinic, Moscow Medical Academy named after I.M. Sechenov, Moscow, Russia
2. Algology Department, Scientific Research institute of General Pathology and Pathophysiology, Moscow, Russia
3. Pfizer International LLC, Moscow, Russia
4. Department of Postgraduate Education in Neurology, Moscow Medical Academy named after I.M. Sechenov, Moscow, Russia
5. Department of Neurology and Neurosurgery, Saint‐Petersburg Medical University named after I.P. Pavlov, Saint‐Petersburg, Russia
6. Biostatistical Department, Hematological Scientific Center, Moscow, Russia