Results of Observational Studies: Analysis of Findings from the Nurses’ Health Study

Author:

Tai Vicky,Grey Andrew,Bolland Mark J.

Publisher

Public Library of Science (PLoS)

Subject

Multidisciplinary

Reference71 articles.

1. Oxford Centre for Evidence-Based Medicine Levels of Evidence Working Group (2009) The Oxford Levels of Evidence 1. Available: http://www.cebm.net/index.aspx?o=1025.

2. A comparison of observational studies and randomized, controlled trials;K Benson;N Engl J Med,2000

3. Randomized, controlled trials, observational studies, and the hierarchy of research designs;J Concato;N Engl J Med,2000

4. Comparison of evidence of treatment effects in randomized and nonrandomized studies;JP Ioannidis;JAMA,2001

5. Beyond randomised versus observational studies;J Concato;Lancet,2004

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