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In the derivation phase, we enrolled 6,033 patients and derived the DIs on the 1,873 patients who received both CXR and chest CT. We then enrolled 5,501 patients in the validation phase and validated the two DIs in the 2,628 patients who had both CXR and chest CT. Along with these 2,628 patients, we incorporated the 2,555 validation phase patients who received only CXR into an enrollment bias sensitivity analysis.
