**Author details**

N.M. Rostovtsev1,2\*, V.G. Polyakov3 and N.E. Kuzmina1

1 GBUZ Chelyabinsk Regional Children's Clinical Hospital, Chelyabinsk, Russia

2 FGBOU VO "South Ural State Medical University" of the Ministry of Health of the Russian Federation, Chelyabinsk, Russia

3 FGBU Blokhin National Medical Research Center of Oncology named after N.N. Blokhin, Moscow, Russia

\*Address all correspondence to: rostovcevnm@mail.ru

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