Statistical Department of Chelyabinsk Oblast / B.A. Napier Urals Research Center for Radiation Medicine Chelyabinsk / TROC / Urals Research Center for Radiation Medicine / ETRC / Extended Techa River Cohort / Russian Federation University of Utah Salt Lake City / ETRC and TROC / US-Russian Joint Coordinating Committee / Number of TROC / Mayak Production Association / /