School-based relationship and sexuality education intervention engaging adolescent boys for the reductions of teenage pregnancy: the JACK cluster RCT by Lohan Maria, Gillespie Kathryn, Aventin Áine, Gough Aisling, Warren Emily, Lewis Ruth, Buckley Kelly, McShane Theresa, Brennan-Wilson Aoibheann, Lagdon Susan, Adara Linda, McDaid Lisa, French Rebecca, Young Honor, McDowell Clíona, Logan Danielle, Toase Sorcha, Hunter Rachael M, Gabrio Andrea, Clarke Mike, O'Hare Liam, Bonell Chris, Bailey Julia V, White James

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