Table 3. Results of the sensitivity analysis.

Excluded study	HR	95% CI
1 Darai, E. (1996)	2.00	1.55–2.57
2 Faleiro Rodrigues, C. (2004)	1.85	1.46–2.33
3 Voutilainen, K. A. (2006)	1.91	1.50–2.45
4 Cho, E. Y. (2006)	2.00	1.54–2.60
5 Blechschmidt, K. (2008)	1.86	1.46–2.36
6 Shim, H. S. (2009)	1.91	1.48–2.47
7 Ho, C. M. (2010)	1.88	1.47–2.40
8 Dian, D. (2011)	1.91	1.50–2.44
9 Huang, K. J. (2012)	1.96	1.54–2.51
10 Taskin S. (2012)	1.83	1.46–2.30
11 Bacic, B. (2013)	1.84	1.45–2.34
12 Huang, H. N. (2014)	1.99	1.57–2.52
13 Wang, Y. (2014)	1.80	1.43–2.27
14 Mise, B. P. (2015)	1.86	1.46–2.37
15 Liew, P. L. (2015)	1.96	1.53–2.50
16 Yu, L. (2015)	1.89	1.48–2.42
17 Sundov D. (2017)	1.81	1.44–2.29