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. 2019 Jun 27;19:635. doi: 10.1186/s12885-019-5830-y

Table 2.

Quality assessment of eligible studies using the Newcastle-Ottawa Scale

References Selection Comparability Outcome NOS
Yao.X.F /201721 ★★★ ★★ ★★★ 8
Terashita.K /201622 ★★★ ★★ ★★★ 8
Wu.D.W /201610 ★★★ ★ ★★★ 7
Goscinski.M /201519 ★★★ ★★ ★★ 7
Murai.T /201413 ★★★ ★ ★★★ 7
Yang.X.Z /201420 ★★★ ★★ ★★★ 8
Bronsert.P /201417 ★★★ ★★ ★★ 7
Hashiguchi.M /201315 ★★★ ★★ ★★★ 8
Zhang.G.J /201311 ★★★ ★★ ★★★ 8
Okugawa.Y /201214 ★★★ ★★ ★★★ 8
Zhou.Y.M /201216 ★★★ ★ ★★★ 7
Kurahara.H /201218 ★★★ ★★ ★★ 7
Singh.A /201112 ★★★ ★ ★★ 6

Abbreviations: NOS Newcastle-Ottawa scale