Table 2. Summary results of the sensitivity analysis.

First author	Year	Country	OR	95% CI	p-value	I2 (%)
Omitting Kimkong, et al.	2011	Thailand	2,852	[1.2318 6.6029]	0.014	0.778
Omitting Bai, et al.	2009	China	2,7051	[1.0791 6.7810]	0.034	0.813
Omitting Xavier, et al.	2007	Brazil	2,2216	[0.8755 5.6376]	0.093	0.826
Omitting Carrozzo, et al.	2004	Italy	2,1411	[0.8577 5.3451]	0.103	0.814
Omitting Al-Mohaya, et al.	2015	Saudi Arabia	1,8232	[0.8529 3.8974]	0.001	0.755
Omitting Chauhan, et al.	2013	India	1,9743	[0.8949 4.3557]	0.092	0.811
Omitting Carrozzo, et al.	2007	Italy	2,9121	[1.3055 6.4961]	0.009	0.797