The Positive Choices trial: update to study protocol for a phase-III RCT trial of a whole-school social-marketing intervention to promote sexual health and reduce health inequalities
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C. Bonell | M. Lohan | R. Campbell | K. Coyle | E. Allen | R. Ponsford | R. Meiksin | S. Morris | H. Young | C. Mercer | G. Melendez-Torres