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. 2019 Jan 7;9:4. doi: 10.1186/s13613-019-0482-2

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Gas flows through the specific interface for the tracheostomy tube (OPT870, Fisher and Paykel, Healthcare, Auckland, New Zealand) tested in the present study. The interface (a) is composed of a connector (length = 38 mm) equipped with a side stream gas delivery tube (diameter 12 mm). The angle between the axes of the connector and the delivery tube is 60° (b)