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. 2014 Jun 25;9(6):e100728. doi: 10.1371/journal.pone.0100728

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© 2014 Odland et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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First trimester^b. ^a Queen Elisabeth Central Hospital (QECH), Mangochi District Hospital, Chiradzulu District Hospital. ^b Up to 12 weeks of gestation.