Forty-five percent of hibakusha have developed some form of thyroid disease since their exposure to radiation from the atomic bombing of Hiroshima and Nagasaki in 1945, according to a study by the Radiation Effects Research Foundation released Wednesday.

The greater the level of radiation, and the younger the age of exposure, the greater the chance of developing a thyroid disease, the study, published in the Journal of the American Medical Association, says.

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