DOI:
10.1055/s-00033990
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References
Wells G, O'Connell J, Shea BJ.
The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomised studies in meta-analyses.
2016 . Available at:
http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp . Accessed April 10, 2020
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