Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russian Federation. Dmitriy Rogachev National Center for pediatric hematology, oncology and immunology. Dmitriy Rogachev National Medical Center of pediatric hematology, oncology and immunology, Moscow, Russian Federation. Dmitriy Rogachev National Center for Pediatric Hematology, Oncology and Immunology, Moscow, Russian Federation. Federal Research Centre of Pediatric Hematology, Oncology and Immunology. National Research Center for Pediatric Hematology, Oncology and Immunology, Moscow, Russian Federation. Dmitry Rogachev National Medical Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russian Federation. Pirogov Russian Clinical Children Hospital, Moscow, Russia, Moscow, Russian Federation. Saint-Petersburg Children City Hospital No 1, Saint Petersburg, Russian Federation. Almazov National Medical Research Center, Saint Petersburg, Russia, Saint Petersburg, Russian Federation. Krasnoyarsk Regional Clinical Hospital, Krasnoyarsk, Russian Federation. Saratov State Medical University, Saratov, Russian Federation. Samara Regional Clinical Children Hospital, Samara, Russian Federation. Perm Regional Clinical Hospital, Perm, Russian Federation. Regional Children Hospital, Ekaterinburg, Russian Federation. Regional Clinical Children's Hospital No 1, Voronezh, Russian Federation. Regional Clinical Children Hospital, Nizhniy Novgorod, Nizhniy Novgorod, Russian Federation. Piotrovich Regional Clinical Children Hospital, Khabarovsk, Khabarovsk, Russian Federation. Dmtri Rogachev Research Center for Pediatric Hematology, Oncology and Immunology, Moscow, Russian Federation.