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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Breath-by-breath analysis: (A) and (B) Bland-Altman plots using the FBGs placed on the umbilicus, FBGA and xiphoid process, FBGT, (C) and (D) linear regression of the results obtained by the FBGs placed on the umbilicus -FBGA- and xiphoid process -FBGT- vs. the reference system.