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. 2015 Jul 14;10(7):e0131692. doi: 10.1371/journal.pone.0131692

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Fig 1 — PRIMP = primiparous, MULTIP = multiparous. PREG1 = mean±SE gestational age 124.9±8.7 days; PREG2/LACT1 = mean±SE gestational age 230.1±8.7 days or mean±SE postnatal age 60.1±8.7 days; LACT2 = mean±SE postnatal age 159.2±8.8 days. **p<0.01.