A school-based social-marketing intervention to promote sexual health in English secondary schools: the Positive Choices pilot cluster RCT by Ruth Ponsford, Sara Bragg, Elizabeth Allen, Nerissa Tilouche, Rebecca Meiksin, Lucy Emmerson, Laura Van Dyck, Charles Opondo, Steve Morris, Joanna Sturgess, Elizabeth Brocklehurst, Alison Hadley, GJ Melendez-Torres, Diana Elbourne, Honor Young, Maria Lohan, Catherine Mercer, Rona Campbell, Chris Bonell

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