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The author declares no competing interests in this article. doi: 10.1038/32567
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Each of the studies contributing data to the present analysis Mortola JP. Breath-by-breath analysis of respiratory
adhered to the standards set by the Declaration of Helsinki, sinus arrhythmia in dogs. Respir Physiol Neurobiol.
and the procedures were approved by the local ethics 2021;294:103776.
committee. In addition, the subjects were informed about doi: 10.1016/j.resp.2021.103776
the measurements to be taken and the study protocols, and
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