Table 3.

Databases used by each meta‐analysis in their study searches

Study, year	PubMed	Embase	Cochrane Library	Google Scholar	CINAHL	CNKI	CBM	CMCC	Others
Handoll et al. (2013)12	√	√	√		√				√
Li et al. (2013)16	√		√						√
Mao et al. (2014)17	√	√	√						√
Jia et al. (2014)14	√	√	√		√	√	√	√	√
Fu et al. (2014)13	√	√	√						√
Sun et al. (2015)15	√	√	√	√					√
Mao et al. (2015)18	√	√	√	√					√
Rabi et al. (2015)19	√	√	√		√				√
Li et al. (2016)20	√	√	√			√	√		√
Du et al. (2017)21	√	√	√						√