1. Department of Radiation Physics and Chemistry, Fukushima Medical University, 1 Hikarigaoka, Fukushima, Japan
2. The Executive Office of the Nuclear Energy Commission, Uildverchid Street 2, Khan Uul District, Ulaanbaatar, Mongolia
3. National Center for Public Health, Ministry of Health, 17 Peace Avenue, Ulaanbaatar, Mongolia
4. Department of Public Health Nursing for International Radiation Exposure, Fukushima Medical University, 1 Hikarigaoka, Fukushima, Japan