Testing innovative strategies to reduce the social gradient in the uptake of bowel cancer screening: a programme of four qualitatively enhanced randomised controlled trials oleh Rosalind Raine, Wendy Atkin, Christian von Wagner, Stephen Duffy, Ines Kralj-Hans, Allan Hackshaw, Nicholas Counsell, Sue Moss, Lesley McGregor, Cecily Palmer, Samuel G Smith, Mary Thomas, Rosemary Howe, Gemma Vart, Roger Band, Stephen P Halloran, Julia Snowball, Neil Stubbs, Graham Handley, Richard Logan, Sandra Rainbow, Austin Obichere, Stephen Smith, Stephen Morris, Francesca Solmi, Jane Wardle