1. Healthcare Quality Improvement Partnership (HQIP) 2013 National Bowel Cancer Audit Programme (NBOCAP) http://www.hqip.org.uk/national-bowel-cancer-audit-programme-nbocap
2. Unacceptable variation in abdominoperineal excision rates for rectal cancer: time to intervene?;Morris;Gut,2008
3. Statistics, damned statistics and time to intervene;Scott;Gut,2009
4. Association of Coloproctology of Great Britain & Ireland Guidelines for the Management of Colorectal Cancer 3rd edition 2007
5. Observational studies in epidemiology (STROBE);Fernandez;Med Clin (Barc),2005