A.A. Zheltova - Post-graduate Student, Volgograd State Medical University. E-mail: ZheltovaA@yandex.ru A.A. Spasov - Corr. Member RAS, Dr.Sc. (Med.), Professor, Volgograd State Medical University. E-mail: aspasov@mail.ru M.V. Haritonova - Ph.D. (Med.), Volgograd State Medical University. E-mail: marykharitonova@yandex.ru S.A. Lebedeva - Ph.D. (Biol.), Volgograd State Medical University A.V. Skalny - Dr.Sc. (Med.), Professor, President of Russian Society of Trace Elements in Medicine (RUSTEM) (Moscow). E-mail: skalny3@microelements.ru Y.N. Lobanova - Ph.D. (Biol.), ANO «Center for Biotic Medicine» (Moscow). E-mail: lobanova_ju@mail.ru M.G. Skalnaya - Dr.Sc. (Med.), Professor, ANO «Center for Biotic Medicine» (Moscow). E-mail: skalnaya@yandex.ru