Pupil-led sex education in England (RIPPLE study): cluster-randomised intervention trial.
Stephenson JM; Strange V; Forrest S; Oakley A; Copas A; Allen E; Babiker A; Black S; Ali M; Monteiro H; Johnson AM; Lancet, 2004, vol. 364, issue 9431, p 338, ISSN 1474547x. ISBN 1474547x.

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