Table 4.

The key characteristics of studies involved.

SNP & study	Country	Ethnicity	Genotyping method	Source of cases	Sample size		Case			Control			p of HWE
					Case	Control	AA	AG	GG	AA	AG	GG
rs895819
Sun et al. 2010	China	Asian	PCR-RFLP	HB	304	304	115	135	54	145	119	40	0.05
Zhou et al. 2012	China	Asian	MassARRAY	HB	295	413	166	122	7	214	167	32	0.94
Song et al. 2014	China	Asian	Direct Sequencing	HB	278	278	105	124	49	131	111	36	0.11
							GG	AG	AA	GG	AG	AA
rs11671784
Song et al. 2014	China	Asian	Direct Sequencing	HB	278	278	128	122	28	100	134	44	0.93
Yang et al. 2014	China	Asian	TaqMan	HB	892	978	398	414	80	371	487	120	0.12

HWE – Hardy-Weinberg equilibrium; PCR-RFLP – polymerase chain reaction-restriction fragment length polymorphism; HB – hospital based of control.