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. 2022 Mar 25;12:5190. doi: 10.1038/s41598-022-09151-7

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Association between ICP in mmHg measured by either external ventricular drain (EVD) or lumbar puncture (LP) and the estimated ICP calculated by photo-plethysmography (PPG). The line of best fit is shown in blue with the 95% confidence interval (shaded area). The line of perfect unity is also shown (black).