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Forest plot comparing operative management characteristics at UMC Mainz (group 1) and the remaining PETS 2 hospitals (group 2)
Values in parentheses are 95 per cent confidence intervals. RR, risk ratio; UMC, University Medical Centre; FNAC, fine-needle aspiration cytology; iFS, intraoperative frozen-section (analysis); PPV, positive predictive value; NPV, negative predictive value.
