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BMJ. Sep 13, 1997; 315(7109): 672–675.
PMCID: PMC2127461
Papers that summarise other papers (systematic reviews and meta-analyses).
T. Greenhalgh
Department of Primary Care and Population Sciences, University College London Medical School/Royal Free Hospital School of Medicine, Whittington Hospital.
T. Greenhalgh: p.greenhalgh/at/
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