DOI: 10.1055/s-00000012

Endoscopy

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References

Wells GA, Shea B, O’Connell DJ et al.
The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomised studies in meta-analyses.
Available at:
http://www.ohri.ca/programs/clinical_epidemiology/oxford.htm Accessed: 2015

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