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Figure 2: Receiver operator characteristic curves for comparing determined cutoff values with sensitivity and specificity of positron emission tomography parameters. (a) The area under the curve value from the receiver operator characteristic curve of maximum standardized uptake value E was 0.917. (b) maximum standardized uptake value D cutoff of 0.969 for dualtimepoint positron emission tomography/computed tomography and (c) the Retention Index with cutoff 16 
