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Quality assessment

JL Jun Long Liao
QQ Qiang Qin
YZ Yong Sheng Zhou
RM Ru Ping Ma
HZ He Chao Zhou
MG Mao Rong Gu
YF Yun Ping Feng
BW Bo Yuan Wang
LY Ling Yang
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The quality of eligible publications was assessed by the Newcastle-Ottawa quality assessment scales (NOS) [15]. The scale contains three parts: the selection of groups (4 questions, 1 score each), the comparability of groups (1 question, 2 scores), the ascertainment of exposure (3 questions, 1 score each). The scores ≥ 5 were regarded as a high-quality study.

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