"It might be well for all of us to remember that, while differing widely in the various little bits we know, in our infinite ignorance we are all equal."
Karl Popper (1902-94)


Prisma Statement Website
PRISMA stands for Preferred Reporting Items for Systematic Reviews and Meta-Analyses. It is an evidence-based minimum set of items for reporting in systematic reviews and meta-analyses. The PRISMA Statement consists of a 27-item checklist and a four-phase flow diagram.

Cochrane Collaboration
The Cochrane Collaboration is an international, independent, not-for-profit organisation of over 28,000 contributors from more than 100 countries, dedicated to making up-to-date, accurate information about the effects of health care readily available worldwide.

Cochrane Back Review Group
The Cochrane Back Review Group (CBRG) is one of 53 international Review Groups. The CBRG coordinates the publication of literature reviews of diagnosis, primary and secondary prevention and treatment of neck and back pain and other spinal disorders, excluding inflammatory diseases and fractures.
Oxford Centre for Evidence-based Medicine - Levels of Evidence

Oxford Centre for Evidence-based Medicine - Table of Evidence Glossary

Das Deutsche Cochrane Zentrum
Website of the German Center of the Cochrane Collaboration 

Das Deutsche Cochrane Zentrum - Cochrane Glossar

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