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. 2018 Apr 5;9:305. doi: 10.3389/fphar.2018.00305

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Copyright © 2018 Del Tredici, Malhotra, Dedek, Espin, Roach, Zhu, Voland and Moreno.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Ethnicity distribution of the study population based on geographical region. (A) US Maps shaded in proportion to the adjusted frequency of the study population for each ethnicity in each geographic region. The bar next to each choropleth map indicates how the shading varies based on frequency which is adjusted for the percentage of samples with reported ethnicity in each region (38–61%). Alaska and Hawaii are not shown on the choropleth, but were included in the data analysis. (B) Geographic regions as defined by states by the US Census Bureau. (C) Frequency of each ethnic group in the entire study population as compared to expected frequencies from the US Census Bureau. ^†US Census data is provided only for those groups that are represented in the current study population; therefore, these percentages do not sum to 100%.