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Crerar-Gilbert, A. J., Kyriacou, P. A., Jones, D. P. and Langford, R. M. (2002). Assessment of photoplethysmographic signals for the determination of splanchnic oxygen saturation in humans. Anaesthesia, 57(5), pp. 442-445. doi: 10.1046/j.0003-2409.2001.02453.x