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. 2015 May 19;5(5):e007838. doi: 10.1136/bmjopen-2015-007838

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Direct comparisons for ultrasound and chest X-ray in two individual studies. Units of analysis are lungs (2 per patient) for Xirouchaki et al 2011,²⁰ and lung regions for Lichtenstein et al 2004¹⁸ (12 per patient).