DOI:
10.1055/s-00000012
Endoscopy
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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.
2011 www.ohri.ca/programs/clinical_epidemiology/oxford.asp. Accessed August 1, 2013
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