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2008 – Internal and external validity of cluster randomised trials: systematic review of recent trials.

2008	Eldridge S, Ashby D, Bennett C, Wakelin M, Feder G	Internal and external validity of cluster randomised trials: systematic review of recent trials.	BMJ 2008;336:876

2008

Eldridge S, Ashby D, Bennett C, Wakelin M, Feder G

Internal and external validity of cluster randomised trials: systematic review of recent trials.