Funding for this research was provided by:
Jeffrey Modell Foundation
Università degli Studi di Milano
Ministry of Health of the Republic of Belarus (20190517)
Received: 27 July 2020
Accepted: 27 March 2021
First Online: 7 April 2021
: This study was conducted in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of the Belarusian Research Center for Pediatric Oncology Hematology and Immunology in Minsk. Written informed consent was obtained from each subject and from parents of subjects below 18 years of age, before inclusion in the study.
: Not applicable.
: All authors declare that they have no competing interests.