DOI:
10.1055/s-00000022
Das Gesundheitswesen
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References
Agency for Healthcare and Quality Research (AHRQ).
Selecting Observational Studies for Comparing Medical Interventions.
2010
http://effectivehealthcare.ahrq.gov/index.cfm/search-for-guides-reviews-and-reports/?pageaction=displayProduct&productID=454
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