1. Sackett DL, Haynes RB, Tugwell P. Clinical epidemiology: a basic science for clinical medicine. Boston: Little, Brown & Company, 1985.
2. National Health and Medical Research Council. Guidelines for the prevention, early detection and management of colorectal cancer. Canberra: Australian Government Publishing Service, 1999.
3. The Steering Committee on Clinical Practice Guidelines for the care and treatment of breast cancer. Adjuvant systemic therapy for women with node-positive breast cancer. Can Med Assoc J 1998;158(Suppl 3):S52–64.
4. Scottish Cancer Therapy Network. Colorectal cancer: a national clinical guideline recommended for use in Scotland. Edingburgh: Scottish Intercollegiate Guideline Network, 1996.
5. Solomon MJ, McLeod RS. Clinical studies in surgical journals: have we improved? Dis Colon Rectum 1993;36:43–8.