Research article

The stepped wedge trial design: a systematic review

Celia A Brown^* and Richard J Lilford

Department of Public Health and Epidemiology, The University of Birmingham, Birmingham, UK

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BMC Medical Research Methodology 2006, 6:54 doi:10.1186/1471-2288-6-54

Published: 8 November 2006

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Data extraction proforma. Proforma used to extract data from the included papers or protocols prior to generating a database from these data.

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