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We inadvertently failed to amend some numbers in the flow
chart of participants, which appeared in the full (web) version of this
paper by Daniel Wight and colleagues
(http://bmj.com/cgi/content/full/324/7351/1430); the chart was not
published in the paper version (15 June, pp 1430-3). The chart contains
two errors. In the first level, the number of schools should be 25 [not 2], and in the left hand box in the second level, the number of
control schools should be 12 [not 2].