Table 3.

The Cochrane Collaboration’s tool for assessing RoB.

	A	B	C	D	E	F	G	H
Niu, 2009	+	+	+	+	+	+	+	7+
Jiang et al., 2014	+	+	?	?	+	−	+	4+
Ou, 2005	+	?	+	+	+	?	+	5+
Ju, 2003	+	?	−	−	+	+	+	4+
Shuang and Tan, 2014	+	?	+	+	+	+	+	6+
Zu, 2015	+	?	−	−	+	+	+	4+
Lai, 2013	+	?	−	−	+	+	+	4+
Liang, 2011	+	?	−	−	+	+	+	4+
Li, 2012	+	?	−	−	+	+	+	4+
Wang et al., 2008	?	?	+	−	+	+	+	4+
Xu, 2006	+	−	+	+	+	+	+	6+
Xu et al., 2004	?	?	+	?	+	+	+	4+
Bao et al., 2016	+	?	+	−	+	?	+	4+
Bao, 2016	+	?	+	−	+	+	+	5+

A, adequate sequence generation; B, concealment of allocation; C, blinding of participants and personnel; D, blinding of outcome assessment; E, incomplete out-come data; F, selective reporting; G, other bias.