title: How to assess natural risks.
mesh_terms: D000328:Adult; D000368:Aged; D001417:Background Radiation; D001943:Breast Neoplasms / Q000453:epidemiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D005313:Fetal Death; D006801:Humans; D007223:Infant; D007226:Infant Mortality; D007231:Infant, Newborn; D007564:Japan; D007953:Leukemia, Radiation-Induced / Q000453:epidemiology; D008017:Life Expectancy; D008175:Lung Neoplasms / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009381:Neoplasms, Radiation-Induced / Q000453:epidemiology*; D011247:Pregnancy; D011829:Radiation Dosage; D012306:Risk; D013274:Stomach Neoplasms / Q000453:epidemiology