1. Does blinding of readers affect the results of meta-analysis?;Lancet,1997
2. The medical review article: state of the science;Mulrow;Arch Intern Med,1987
3. A look at the statistical overview (or meta-analyses);West;J R Coll Phys Lond,1993
4. Publication bias, a problem in interpreting medical data;Begg;J R Stat Soc,1988
5. Publication bias in statistical overview of trials: example of psychological rehabilitation following myocardial infarction;West;Heart,1997