The effect of optimised patient information materials on recruitment in a lung cancer screening trial: an embedded randomised recruitment trial

Adwoa Parker, Peter Knapp, Shaun Treweek, Vichithranie Madhurasinghe, Roberta Littleford, Stephanie Gallant, Frank Sullivan, Stuart Schembri, Jo Rick, Jonathan Graffy, David J Collier, Sandra Eldridge, Anne Kennedy, Peter Bower