1. Seversk Biophysical Research Center of the Federal Medical and Biological Agency, Seversk, Russia
2. Siberian State Medical University of the Ministry of Health of the Russian Federation, Tomsk, Russia
3. Siberian Federal Research and Clinical Center of the Federal Medical and Biological Agency, Seversk, Russia
4. Center of Hygiene and Epidemiology №81 of the Federal Medical and Biological Agency, Seversk, Russia
5. Department of Epidemiology and Biostatistics, School of Medicine, University of California, San Francisco, CA, USA