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. 2020 Oct 23;6:43. doi: 10.1038/s41522-020-00152-w

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Shown are scanning electron microscopy micrographs of lead coupons (a, b) and PVC tubing (c, d) for the experimental cases of high phosphate (a, c) and low phosphate (b, d). The scale is indicated as line with tick marks in the lower right corner of the figure, corresponding with 10µm (a–d) and 5µm (b).