Safetxt: a safer sex intervention delivered by mobile phone messaging on sexually transmitted infections (STI) among young people in the UK - protocol for a randomised controlled t... by Karen Devries, Ford Colin Ian Hickson, Ian Roberts, Melissa J Palmer, George B Ploubidis, Kaye Wellings, Paula Baraitser, Susan Michie, Caroline Free, Julia V Bailey, Ona L McCarthy, Rosemary Knight, Phil Edwards, Rebecca French, Graham Hart, Tim Clayton, James R Carpenter, Katy M E Turner, Kimberley Potter

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