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

标题
Internal and external validity of cluster randomised trials: systematic review of recent trials
作者
关键词
-
出版物
BMJ-British Medical Journal
Volume 336, Issue 7649, Pages 876-880
出版商
BMJ
发表日期
2008-03-26
DOI
10.1136/bmj.39517.495764.25

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