Systematic review of D2 lymphadenectomy versus D2 with para-aortic nodal dissection for advanced gastric cancer

Table 3 Potential bias of included studies

Study ID (author, yr)	Adequate sequence generation	Allocation concealment	Blinding	Incomplete outcome data addressed	Free of selective reporting	Free of other bias
Jiang et al 2000[36]	Probably yes	Probably yes	Probably yes	Yes	Probably yes	Probably yes
Sano et al 2004[37], Sasako et al 2008[39]	Yes	Yes	Probably yes	Yes	Probably yes	Probably yes
Yonemura et al 2006 and 2008[40,41]	Yes	Probably yes	Probably yes	Yes	Probably yes	Probably yes
Kulig et al 2007[42]	Yes	Probably yes	Probably yes	Yes	Probably yes	Probably yes
Maeta et al 1999[43]	No	No	Probably yes	Yes	Probably yes	Probably yes
Bostanci et al 2004[44]	No	No	Probably yes	Yes	Probably yes	Probably yes
Kunisaki et al 2006[45]	No	No	Probably yes	Yes	Probably yes	Probably yes
Hu et al 2009[46]	No	No	Probably yes	Probably yes	Probably yes	Probably yes