Halligan, S., Dadswell, E., Wooldrage, K., Wardle, J., von Wagner, C., Lilford, R., . . . Atkin, W. (2015). Computed tomographic colonography compared with colonoscopy or barium enema for diagnosis of colorectal cancer in older symptomatic patients: Two multicentre randomised trials with economic evaluation (the SIGGAR trials). Health Technol Assess.

Halligan, Steve, Edward Dadswell, Kate Wooldrage, Jane Wardle, Christian von Wagner, Richard Lilford, Guiqing L. Yao, Shihua Zhu, و Wendy Atkin. "Computed Tomographic Colonography Compared With Colonoscopy or Barium Enema for Diagnosis of Colorectal Cancer in Older Symptomatic Patients: Two Multicentre Randomised Trials With Economic Evaluation (the SIGGAR Trials)." Health Technol Assess 2015.

Halligan, Steve, et al. "Computed Tomographic Colonography Compared With Colonoscopy or Barium Enema for Diagnosis of Colorectal Cancer in Older Symptomatic Patients: Two Multicentre Randomised Trials With Economic Evaluation (the SIGGAR Trials)." Health Technol Assess 2015.