Table I.

Characteristics of the studies included in the meta-analysis.

First author (year)	Region	Ethnicity	Design	Genotyping	Case (n)	Control (n)	Refs.
Jiang et al (2003)	China	Asian	PB	PCR/SSP	52	106	(34)
Park et al (2003)	Korean	Asian	PB	PCR/RFLP/SSCP	135	100	(43)
Xi-Lin et al (2006)	China	Asian	HB	PCR/SSP	139	134	(44)
Liu and Cheng (2007)	China	Asian	PB	PCR/SSP	168	100	(45)
Zhu et al (2007)	China	Asian	HB	PCR/SSP	151	133	(46)
Zhang et al (2015)	China	Asian	HB	PCR/SSP	110	100	(35)
Li et al (2015)	China	Asian	HB	PCR/SSP	60	58	(37)

HB, hospital-based; PB, population-based; PCR, polymerase chain reaction; SSP, sequence-specific primer; SSCP, single-strand conformation polymorphism; RFLP, restriction fragment length polymorphism.