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Graphical abstract of the proposed study. (a) Model training and evaluation with baseline pediatric CXR data; (b) using the best performing model from (a) to weakly classify CXRs from Radiological Society of North America (RSNA), National Institutes of Health (NIH), and CheXpert containing pneumonia-related opacities, as showing bacterial or viral pneumonia; and (c) augmenting the baseline training data with weakly labeled CXRs to check for performance improvement.
