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. 2021 Sep 27;12:732711. doi: 10.3389/fphys.2021.732711

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Copyright © 2021 Yao, Xie, Zhang, Dong, Qiu, Yuan, Jia, Wang, Shi, Zhuang, Que, Xu and Huang.

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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Examples of various relative position including (A) top, (B) middle, (C) top and middle, (D) bottom, (E–G) whole, and (H) multiple position in TBAD. The red, blue, and yellow parts correspond to TL, FL, and FLT, respectively. Best viewed in color.