Reducing the socioeconomic gradient in uptake of the NHS bowel cancer screening Programme using a simplified supplementary information leaflet: a cluster-randomised trial oleh Samuel G. Smith, Jane Wardle, Wendy Atkin, Rosalind Raine, Lesley M. McGregor, Gemma Vart, Steve Morris, Stephen W. Duffy, Susan Moss, Allan Hackshaw, Stephen Halloran, Ines Kralj-Hans, Rosemary Howe, Julia Snowball, Graham Handley, Richard F. Logan, Sandra Rainbow, Steve Smith, Mary Thomas, Nicholas Counsell, Christian von Wagner