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. 2017 Jul 19;1(3):184–191. doi: 10.1017/cts.2017.7

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© The Association for Clinical and Translational Science 2017

This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1 — Flow diagram of samples by type of recruitment. ^aSource: National Children’s Study [18]. ^bSample for this study. IVC Participant Recruitment Dataset V2.1, IVC Enrolled Women Analysis File V2.1, IVC Recruitment Analysis File V2.1, and ARS Analysis File V3.1.