Challenges in the research ethics review of cluster randomized trials: international survey of investigators.
Chaudhry SH; Brehaut JC; Grimshaw JM; Weijer C; Boruch R; Donner A; Eccles MP; McRae AD; Saginur R; Skea ZC; Zwarenstein M; Taljaard M; Clinical Trials (London, England), 2013, vol. 10, issue 2, p 257, ISSN 17407753. ISBN 17407753.

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