The design and use of cluster randomised controlled trials in evaluating injury prevention interventions: part 2. Design effect, sample size calculations and methods for analysis.
C. Coupland, and C. DiGuiseppi. Injury prevention : journal of the International Society for Child and Adolescent Injury Prevention, 16 (2):
132-6(April 2010)5737<m:linebreak></m:linebreak>JID: 9510056; ppublish;.
DOI: 10.1136/ip.2009.023127
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