Circular instead of hierarchical: methodological principles for the evaluation of complex interventions

Harald Walach(European University Viadrina), Wayne B. Jonas(Samueli Institute), George Lewith(University of Southampton), Vinjar Fønnebø(UiT The Arctic University of Norway), Torkel Falkenberg(Karolinska Institutet)
BMC Medical Research Methodology
June 24, 2006
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