State licensure and professional monopolies in medicine.


3. Borenstein M, Hedges LV, Higgins JP, Rothstein HR. Criticisms of meta-analysis. In: Introduction to Meta-Analysis. Chichester, England: John Wiley & Sons; 2009: chap 43. 4. Rücker G, Schwarzer G, Carpenter J, Schumacher M. Undue reliance on I2 in assessing heterogeneity may mislead. BMC Med Res Methodol. 2008;8:79. 5. Deeks JJ, Higgins JP, Altman D… (More)
DOI: 10.1001/jama.2009.907


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