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Means of mammographic density across age groups between women in China and Australia (error bars: ± SE). (A) Means of percentage density of left breasts. (B) Means of percentage density of right breasts. (C) Means of percentage density of average values of both breasts. (D) Means of dense area of left breasts. (E) Means of dense area of right breasts. (F) Means of dense area of average values of both breasts
