DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Wells GA, Shea B, O'Connell D. et al.
The Newcastle-Ottawa scale (NOS) for assessing the quality of non randomised studies in meta-analyses.
2011
http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp (accessed 24 November 2017)
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