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Table 2 Methodological quality of the cohort studies according to the NOS

From: Therapeutic effect of autologous bone grafting with adjuvant bone morphogenetic protein on long bone nonunion: a systematic review and meta-analysis

Study Selection of cohorts Comparability of cohorts Assessment of outcome Total score
Takemoto [10] 7
Von Ruden(a) [11] 9
VonRuden(b) [12] 9
Hackl [13] 9
Liu [14] 6