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. 2015 Dec 30;5(12):e009555. doi: 10.1136/bmjopen-2015-009555

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Geographical location of Minamisoma City. Base map indicates the air dose rate (μSv/h) as of 28 June 2012. Blue circles show the geographical distribution of the study participants, where the sizes of the circles are proportional to the number of participants living in each district.