DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Wells GA, Shea B, O'Connell D. , et al.
The Newcastle-Ottawa Scale (NOS) for Assessing the Quality of Nonrandomised Studies in Meta-Analyses.
2014
http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp . Accessed December 15, 2017.
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