Table 1. Main characteristics of selected studies in following meta-analysis.

Study	Year	Ethnicity or country	Population	Case #	Control #	P value
Ho [17]	2011	China	Asian	892	890	0.965
Xiong [18]	2010	China	Asian	2124	2124	0.14
Li [50]	2012	China	Asian	229	267	0.484
Zhang [19]	2014	China, South Korea and Japan	Asian	14963	31945	0.03
He [20]	2011	European American	American	1171	1534	NA
He [20]	2011	African American	American	382	510	NA
He [20]	2011	Native Hawaiian	American	323	472	NA
He [20]	2011	Japanese Americans	American	1042	1426	NA
He [20]	2011	Latino	American	393	524	NA
Hutter [21]	2012	United States, Canada and Europe	American	7016	9723	0.01
Wang [22]	2013	African American	American	1894	4703	0.12
Kupfer [23]	2010	African American	American	795	985	0.44
Kupfer [23]	2010	European American	American	399	367	0.10
Mates [25]	2010	Romanian	European	92	96	0.303
Holst [24]	2010	Swedish	European	1755	1691	0.051
Houlston [16]	2008	United Kingdom	European	20186	20855	1.20E-08
			n =131768	n=53656	n=78112

NA, not reported;