TY JOUR TI The Genesis of Legal Liability for Improper Provision of Medical Services in Russia during the XI-XX Centuries KW sources of law KW customary law KW medical treatment KW Russian pre-revolutionary legislation KW history of medical activity KW medical services KW medical crimes KW medical error KW injury to health KW legal liability of medical workers JO Bulletin of the Kazan Law Institute of MIA Russia AU Kobets, P.N. PY 2022 IS 13 PB Kazan law institute Ministry of Internal Affairs Russian Federation