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Hazard ratios from studies comparing PSQ with IHC.
CI: confidence interval; CpG: 5'‐cytosine‐phosphate‐guanine‐3'; FFPE: formalin‐fixed paraffin embedded; HR: hazard ratio; IHC: immunohistochemistry; N/A: not applicable; NR: not reported; PCR: polymerase chain reaction; PF: prognostic factor; PSQ: pyrosequencing; RoB: risk of bias; sel. rep.: selective reporting
