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. 2017 Feb 14;7:42293. doi: 10.1038/srep42293

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(A) Spatiotemporal diameter map of LDCs showing propagation at a speed of 2.1 ± 0.3 cm/s from proximal to distal. The red boxed area (a) shows an obvious peristaltic wave, enlarged at right. (B) Clear propagations were shown in pressure maps of LDCs. A zoomed in portion (b) on the right side of the pressure map shows an obvious antegrade propagation with an average velocity of 1.8 ± 0.4 cm/s.