Figure 1.
Figure 1. All-cause mortality. −, low risk of bias; +, high risk of bias; ?, unkown risk of bias; df, degree of freedom; M-H, Mantel Haenszel; trt, treatment.

All-cause mortality. −, low risk of bias; +, high risk of bias; ?, unkown risk of bias; df, degree of freedom; M-H, Mantel Haenszel; trt, treatment.

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