Comment on

• Design of a multicentre randomized trial to evaluate CT colonography versus colonoscopy or barium enema for diagnosis of colonic cancer in older symptomatic patients: the SIGGAR study.

  Halligan S, Lilford RJ, Wardle J, Morton D, Rogers P, Wooldrage K, Edwards R, Kanani R, Shah U, Atkin W. Halligan S, et al. Trials. 2007 Oct 27;8:32. doi: 10.1186/1745-6215-8-32. Trials. 2007. PMID: 17963520 Free PMC article.
• Patient acceptability of CT colonography compared with double contrast barium enema: results from a multicentre randomised controlled trial of symptomatic patients.

  von Wagner C, Smith S, Halligan S, Ghanouni A, Power E, Lilford RJ, Morton D, Dadswell E, Atkin W, Wardle J; SIGGAR Investigators. von Wagner C, et al. Eur Radiol. 2011 Oct;21(10):2046-55. doi: 10.1007/s00330-011-2154-y. Epub 2011 May 31. Eur Radiol. 2011. PMID: 21626363 Clinical Trial.
• Computed tomographic colonography versus barium enema for diagnosis of colorectal cancer or large polyps in symptomatic patients (SIGGAR): a multicentre randomised trial.

  Halligan S, Wooldrage K, Dadswell E, Kralj-Hans I, von Wagner C, Edwards R, Yao G, Kay C, Burling D, Faiz O, Teare J, Lilford RJ, Morton D, Wardle J, Atkin W; SIGGAR investigators. Halligan S, et al. Lancet. 2013 Apr 6;381(9873):1185-93. doi: 10.1016/S0140-6736(12)62124-2. Epub 2013 Feb 14. Lancet. 2013. PMID: 23414648 Clinical Trial.