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. 2015 Aug 4;15:161. doi: 10.1186/s12884-015-0597-x

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© Gresham et al. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Flow chart showing the selection of participants, using the 1973–1978 cohort from the Australian Longitudinal Study on Women’s Health (ALSWH) and the NSW Perinatal Data Collection (PDC)