Ponsford, R; Allen, E; Campbell, R; Elbourne, D; Hadley, A; Lohan, M; Melendez-Torres, GJ; ... Bonell, C; + view all Ponsford, R; Allen, E; Campbell, R; Elbourne, D; Hadley, A; Lohan, M; Melendez-Torres, GJ; Mercer, CH; Morris, S; Young, H; Bonell, C; - view fewer (2018) Study protocol for the optimisation, feasibility testing and pilot cluster randomised trial of Positive Choices: A school-based social marketing intervention to promote sexual health, prevent unintended teenage pregnancies and address health inequalities in England. Pilot and Feasibility Studies , 4 , Article 102. 10.1186/s40814-018-0279-3.