DOI:
10.1055/s-00000009
American Journal of Perinatology
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References
Wells GA, Shea B, O'Connell D. , et al.
The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomized studies in meta-analyses.
Ottawa Hospital Research Institute; Available at:
http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp . Accessed May 5, 2020
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