| (sensitivity of ultrasound × sensitivity of CT ×
[prevalence of HCC in cirrhosis × prevalence of 1 cm to 2 cm HCC]) / (sensitivity of ultrasound × sensitivity of CT × [prevalence of HCC × prevalence of 1 cm to 2 cm HCC] + ([1 – specificity of ultrasound] × [1 – specificity of CT] × [1 – prevalence of HCC × prevalence of 1 cm to 2 cm HCC]) |
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