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Flowchart of data collection and measurement scenarios. Abbreviations: near infrared spectroscopy, NIRS; regional oxygen saturation, rSO2; cerebral, c; splanchnic, s; fractional tissue oxygen extraction, FTOE; cerebro–splanchnic oxygenation ratio, CSOR; heart rate, HR; respiratory rate, RR; pulsed arterial oxygen saturation, SaO2.
