Patients' and healthcare professionals' values regarding true- and false-positive diagnosis when colorectal cancer screening by CT colonography: discrete choice experiment - Boone, D; Mallett, S; Zhu, S; Yao, G; Bell, N; Ghanouni, A; Von Wagner, C; Taylor, SA; Altman, D; Lilford, R; Halligan, S (PLoS ONE, 2013)