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. 2019 Apr 24;6:85. doi: 10.3389/fmed.2019.00085

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Copyright © 2019 Pearson and Werth.

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(s) 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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Heatmaps of prevalence per 100,000 of the full cohort of dermatomyositis (DM) patients (a), and subtypes classic DM (CDM, b) and clinically amyopathic DM (CADM, c) in the greater Philadelphia metropolitan area (legend inset: low prevalence, blue; high prevalence, orange). Many ZCTAs with high prevalence of DM and CDM are observed in the western and northern metropolitan area. CADM prevalence is lower across the region and aligns along a northeast-southwest axis.