Funding: The work was performed within the framework of the Federal Targeted Program "Nuclear and Radiation Safety" and was financially supported by the Federal Medical — Biological Agency of Russia. The methodological approaches were developed with financial support from the Federal Medical — Biological Agency of Russia and the Office of International Health Programs of the U.S. Department of Energy as part of the joint U.S.-Russian JCCRER 1.1 project.

Author contribution: all authors contributed equally to the development of research methodology, data acquisition, analysis, and interpretation, and to the writing and editing of the article.