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Table 3 Risk of bias in the trials included in the present meta-analysis

From: Radiofrequency ablation versus percutaneous ethanol injection for hepatocellular carcinoma: a meta-analysis of randomized controlled trials

Bias Lencioni, 2003 Lin, 2004 Lin, 2005 Shiina, 2005 Brunello, 2008 Giorgio, 2011 Wang, 2011 Azab, 2011
Sequence generation + + + + + + ? ?
Allocation concealment ? ? ? ? + + ? ?
Double-blinding
Incomplete outcome data + +
Selective outcome reporting +
Other sources of bias + + +
Early stopping ? +
Baseline imbalance
  1. +, yes; −, no; ?, unclear.