L. Ya. Kravets
Privolzhskiy Research Medical University, Ministry of Health of Russia
Russian Federation

development of the concept and design of the study, article writing

S. N. Gryaznov
Ivanovo Regional Clinical Hospital
Russian Federation

formation of the database and working tables, primary data analysis, information collection via phone

S. Ya. Kalinina
Privolzhskiy Research Medical University, Ministry of Health of Russia
Russian Federation

statistical analysis of the material

P. I. Ivanov
A.L. Polenov Russian Research Institute of Neurosurgery – branch of V.A. Almazov National Medical Research Center, Ministry of Health of Russia
Russian Federation

participation in database preparation, editing of the section “Materials and methods”