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Egger M, Davey Smith G, Altman DG (2001)
Systematic reviews in health care. London: BMJ Books.
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Kunz R, Vist G, Oxman AD (2002)
Randomisation to protect against selection bias in healthcare trials. Cochrane Database of Methodology Reviews 4:MR000012
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Thomas J, Harden A, Oakley A, Oliver S, Sutcliffe K, Rees R, Brunton G, Kavanagh J (2004)
Integrating qualitative research with trials in systematic reviews. BMJ 328:1010-1012.
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