Table 4. Sensitivity analysis results.

Excluded studies	HR (95% CI)
Zhu ZH	0.56 (0.40, 0.78)
Cao JW	0.55 (0.39, 0.77)
Lv ZQ	0.59 (0.43, 0.81)
Li HG	0.63 (0.46, 0.86)
Suemitsu R	0.55 (0.41, 0.74)

HR: hazard ratio; CI: confidence interval;