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. 2018 Sep 7;9:989. doi: 10.3389/fphys.2018.00989

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Copyright © 2018 Bernabeu, Lu, Abu-Qamar, Aiello and Sun.

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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AR is defined as the projected area on one side of the centerline (A1) divided by the area on the other side of the centerline (A2), where A1 > A2. This definition applies to both saccular (left) and fusiform (right) MAs as shown in this figure.