DOI:
10.1055/s-00025476
Endoscopy International Open
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References
Wells G, Shea B, OʼConnell D. et al.
The Newcastle-Ottawa Scale (NOS) for assessing the quality of nonrandomised studies in meta-analysis. 3rd Symposium on Systematic Reviews: Beyond the Basics; July 3–5.
Oxford: 2000 Available at (Accessed 24.11.2019):
http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp
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