A peer-led, school-based social network intervention for young people in the UK, promoting sexual health via social media and conversations with friends: intervention development and optimisation of STASH

• Carrie PurcellThe Open University
• Lisa Margaret McDaidThe University of Queensland
• Ross ForsythMRC/CSO Social and Public Health Sciences Unit
• Sharon Anne SimpsonMRC/CSO Social and Public Health Sciences Unit
• Lawrie ElliottGlasgow Caledonian University
• Julia BaileyThe Royal Free Hospital
• Laurence MooreMRC/CSO Social and Public Health Sciences Unit
• Kirstin Rebecca MitchellMRC/CSO Social and Public Health Sciences Unit