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; RIPPLE study team.
Stephenson JM, et al. Among authors: oakley a.
Lancet. 2004 Jul 24-30;364(9431):338-46. doi: 10.1016/S0140-6736(04)16722-6.
Lancet. 2004.
PMID: 15276393
Clinical Trial.