The harvest plot: A method for synthesising evidence about the differential effects of interventions

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David Ogilvie^*, Debra Fayter^†, Mark Petticrew^†, Amanda Sowden^†, Sian Thomas^†, Margaret Whitehead^† and Gill Worthy^†

BMC Medical Research Methodology 2008, 8:8 doi:10.1186/1471-2288-8-8