Blood spots as an alternative to whole blood collection and the effect of a small monetary incentive to increase participation in genetic association studies.

After controlling for year of birth, we also observed a borderline significant difference in the distribution of occupational radiation breast dose among controls who did and did not provide a dried blood spot card, with a greater proportion of participating compared to non-participating controls being in the highest radiation dose category (> 0.06 Gy) (Table 1 ).

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