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. 2022 Sep 5;60(11):3057–3068. doi: 10.1007/s11517-022-02658-1

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© The Author(s) 2022

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Fig. 2 — Physiological databases. a Queensland database structure which consists of 32 folders; each folder contains eight physiological parameters. Only PPG signal recordings were separated (shaded box) for further processing. b The MIMIC database contains 3000 recordings of three physiological parameters, including PPG signals. Each recording folder contains recorded parameters from each non-anesthesia and anesthesia patient with variable measurement duration