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. 2016 Jun 10;15:89. doi: 10.1186/s12939-016-0378-9

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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 — Palmetto Small-Area Deprivation Index (SADI) conceptual framework. Based on Lu Ann Aday’s “Framework for studying vulnerable populations.” (Aday LA. At risk in America: the health and health care needs of vulnerable populations in the United States. San Francisco, CA: Jossey-Bass; 2001)