Garrido-Estepa et al. BMC Cancer 2010, 10:485 http://www.biomedcentral.com/1471-2407/10/485 Authors’ contributions MP was responsible for the study concept. NA, IGR, CSC, CS, PM, CV & DS were the main responsible of DDM-Study in the corresponding screening programs and provided valuable input to the study desing. FRP & JM conducted a pilot study to verify the quality of mammograms in the different programs. FRP evaluated mammographic density using the four scales. MG & MP performed the statistical analysis and prepared the first draft of the manuscript. The rest of the authors were involved in the field work of the study, recruiting participants, collecting the corresponding mammograms and the information needed to carry out the study. All authors critically revised the manuscript and suggested helpful comments that were subsequently introduced in the text. All authors read & approved the final manuscript. Competing interests The authors declare that they have no competing interests. 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