Thacker SB.Meta-analysis: a quantitative approach to research integration. JAMA1988; 259: 1685-1689.
2.
Mulrow CD.Rationale for systematic reviews. In: Chalmers I, Altman DG eds. Systematic reviews. London: BMJ Publishing Group, 1995: 1-8.
3.
Antiplatelet Trialists’ Collaboration. The aspirin papers. Aspirin benefits patients with vascular disease and those undergoing revascularisation. Br Med J1994; 308: 71-72, 81-106.
4.
Dickersin K, Scherer R, Lefebvre C.Identifying relevant studies for systematic reviews. Br Med J1994; 309: 1286-1291.
5.
The Cochrane Library. Oxford: Update Software Ltd, 1998: Issue 1.