1. Research Institute of Pediatric Oncology and Hematology of N.N. Blokhin National Medical Research Centre of Oncology, Ministry of Health of Russia
2. Russian Scientific Center of Surgery named after Academician B.V. Petrovsky, Ministry of Health of Russia
3. Bryansk Regional Children’s Hospital
4. Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Ministry of Health of Russia