Table 2. Frequencies of genotype.

First author (year)	County	Source of control	Genotyping method	Simple size cases/control	Genotype distribution cases/control					HWE Y/N(P)
					GG	GA	AA	G	A
Wang,2005	China	PB	PCR-RFLP	75/137	45/106	27/22	3/9	117/234	33/40	Y(0.149)
Wu,2007	China	PB	PCR-RFLP	183/111	147/95	33/14	3/2	327/204	39/18	Y(0.105)
Yang,2005	China	PB	PCR-RFLP	96/116	63/88	33/24	0/4	159/200	33/32	Y(0.162)
Li,2004	China	PB	PCR-RFLP	259/341	224/300	33/39	2/2	481/639	37/43	Y(0.555)
Yucesoy,2001	USA	PB	PCR-RFLP	294/154	123/75	166/75	5/4	412/225	176/83	N(0.003)
Wang,2005	China	PB	PCR-RFLP	126/122	110/117	16/5	0/0	236/239	16/5	Y(0.817)
Wang,2012	China	PB	PCR-RFLP	68/68	42/52	23/15	3/1	107/119	29/17	Y(0.944)
Isa,2012	Iran	PB	PCR-RFLP	45/45	19/22	21/20	5/3	59/64	31/26	Y(0.584)
Corbett,2002	South Africa	PB	PCR-RFLP	121/120	73/73	41/36	7/11	187/182	55/58	Y(0.054)