It is the device which has been published here: «Wearable radio-frequency sensing of respiratory rate, respiratory volume, and heart rate» https://www.nature.com/articles/s41746-020-0307-6 Similar to for gold standard for HR measurement which requires: a setup wich is based on combined signals from: developed by a bioinformatician like Rob ter Horst, and published in Nature. But Peter Gamma …
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