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. 2011 Oct 12;6(10):e25636. doi: 10.1371/journal.pone.0025636

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Thang 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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A–D, Arsenic (A, B) and barium (C, D) concentrations in well water samples from Bangladesh (A, C) and Vietnam (B, D) are presented. Value in each sample (lanes 1 and 2 in A–D) and mean ± SE (lanes 3 and 4 in A–D) are presented for samples from arsenic-polluted areas at Jessore in Bangladesh (lanes 2 and 4 in A and C) and Mekong Delta in Vietnam (lanes 2 and 4 in B and D) and control areas at Dhaka in Bangladesh (lanes 1 and 3 in A and C) and Ho Chi Minh in Vietnam (lanes 1 and 3 in B and D). * and **, Significantly different (*, p<0.05; **, p<0.01), respectively) from the control by the Mann-Whitney U test.