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Stephenson, J.M., Strange, V., Forrest, S., Oakley, A., Copas, A., Allen, E., et al. (2004) Pupil-led sex education in England (RIPPLE study): Cluster-randomized intervention trial. Lancet, 364, 338-346. doi:10.1016/S0140-6736(04)16722-6

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