Dr. Bracken et al. (1) raise several issues in their interpretation of our recent commentary, "New models for large prospective studies: Is there a better way?" (2). Although the 12 points raised by Bracken et al., all of whom are described as associated with the US National Children's Study, begin with issues related to our commentary, their later points stray into criticisms of the National Children's Study with which we were not directly concerned. On most of the other points, however, we appear to be in full, even vehement, agreement.
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