Affected and unaffected prefectures in northeast Japan Affected and unaffected prefectures in northeast Japan.57 The proportions of evacuees are represented according to the numbers of evacuees in March 2012.58 The areas of the circles are proportional to the population size. Affected and unaffected prefectures in northeast Japan.57 The proportions of evacuees are represented according to the numbers of evacuees in March 2012.58 The areas of the circles are proportional to the population size. Hiroshi Yokomichi et al. BMJ Open 2016;6:e010978 ©2016 by British Medical Journal Publishing Group