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. 2017 Feb 8;5:2. doi: 10.3389/fpubh.2017.00002

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Copyright © 2017 Liu, Yip, Zeig-Owens, Weakley, Webber, Schwartz, Prezant, Weiden and Hall.

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) or licensor 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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Model schematic of assessing obstructive airways disease as a mediator (M₁) of the association between World Trade Center (WTC) exposure (X₁) and CRS (Y₁) and between WTC exposure and gastroesophageal reflux disease (Y₂).