Table 1. Eligible Studies and data.

first author	year	country	ethnicity	source of control	Cases			Controls
					GG	GA	AA	GG	GA	AA
Lingping Lai [9]	2002	China	Asian	HB	64	37	7	46	44	18
Ni Aizhen [10]	2004	China	Asian	PB	54	37	3	72	48	10
Cinzia Fatini [5]	2006	Italy	Caucasian	HB	118	155	58	116	207	118
Andrzej prytupa [6]	2006	Poland	Caucasian	PB	24	38	7	3	45	13
LOU Sheng [7]	2006	China	Asian	PB	63	41	7	60	29	12
ZENG Zhi-yu [11]	2007	China	Asian	PB	71	60	10	55	54	11
Xu Lixin [8]	2008	China	Asian	HB	77	61	9	75	56	16
Yao Juan [15]	2011	China	Asian	HB	158	117	28	129	159	40
Yao Juan [16]	2012	China	Asian	HB	133	138	36	118	148	64
Mao Ting [17]	2012	China	Asian	HB	218	201	69	188	215	85

PB: population-based; HB: hospital-based.