1. Jenicek M. Meta-analysis in medicine: where we are and where we want to go. J Clin Epidemiol. 1989;42:35–44.
2. L’Abbé KA, Detsky AS, O’Rourke K. Meta-analysis in clinical research. Ann Intern Med. 1987;107:224–33.
3. Cooper H, Hedges LV, editors. The handbook of research synthesis. New York: Russell Sage Foundation; 1994.
4. Cook TD, Cooper H, Gordray DS, et al. Meta-analysis for explanation: a casebook. New York: Russell Sage Foundation; 1992.
5. Glasziou P, Irwig L, Bain C, Colditz G. Systematic reviews in health care: a practical guide. Cambridge: Cambridge University Press; 2001.