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The methodological quality of cluster randomised controlled..:

Bowater, Russell J. ; Abdelmalik, Sally M.E. ; Lilford, Richard J.
Transactions of the Royal Society of Tropical Medicine and Hygiene.  103 (2009)  5 - p. 429-436 , 2009
Link: https://doi.org/10.1016/j.trstmh.2009.01.015