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. 2020 Apr 2;11:155. doi: 10.3389/fneur.2020.00155

Table 3.

Internal validity analysis.

References 2 3 4 5 6 7 8 9 10 11 Total
Wang and Chen (33 ) - - - - - 5
Xu (34) - - - 7
Yao (21) - - 8
Xie et al. (35) - - - 7
Zhang et al. (36) - - - 7
Zhou and Ye (30) - - - 7
Lin et al. (37) - 9
Lee et al. (10) - 9
Kim et al. (31) 10
Schick et al. (18) 9
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