TY - JOUR T1 - Development of theory-based health messages: three-phase programme of formative research. JO - Health Promot Int UR - http://eprints.whiterose.ac.uk/91490/ PY - 2014/02/05 AU - Epton T AU - Norman P AU - Harris P AU - Webb T AU - Snowsill FA AU - Sheeran P ED - DO - DOI: 10.1093/heapro/dau005 VL - 30 IS - 3 SP - 756 EP - 768 Y2 - 2025/05/02 ER -