Trial Protocol: Communicating DNA-based risk assessments for Crohn's disease: a randomised controlled trial assessing impact upon stopping smoking by Armstrong David, Prevost A Toby, Hollands Gareth J, Sanderson Jeremy, Watts Sally, Forbes Alastair, Lewis Cathryn M, Mathew Christopher G, Whitwell Sophia CL, Kinmonth Ann, Sutton Stephen, Marteau Theresa M

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