id: identification number
author: The first author name of the corresponding study
year: The published year of the corresponding study
method: The diagnostic method; 1=CT (computed tomography), 2=LAG (lymphangiography), 3=MRI (magnetic resonance imaging)
TP: A vector of the number of true positives (TP)
FP: A vector of the number of false positives (FP)
FN: A vector of the number of false negatives (FN)
TN: A vector of the number of true negatives (TN)
data(cervical)A data frame with 44 rows and 8 variables
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