Stephenson, J.M., Strange, V., Forrest, S., Oakley, A., Copas, A., Allen, E., Babiker, A., Black, S., Ali, M., Monteiro, H. and Johnson, A.M. (2004) Pupil-led sex education in England (RIPPLE study): cluster-randomised intervention trial. The Lancet, 364(9431), pp. 338-346. ISSN (online) 0140-6736
Official URL: http://dx.doi.org/10.1016/S0140-6736(04)16722-6
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