1. N.N. Petrov Institute of Oncology St. Petersburg Russia
2. St. Petersburg State Pediatric Medical University St. Petersburg Russia
3. The Dmitry Rogachev National Research Centre of Pediatric Hematology, Oncology and Immunology Moscow Russia
4. Clinical Research and Practical Center for Specialized Oncological Care St. Petersburg Russia
5. Moscow City Oncology Hospital #62 Moscow Russia