1. A controlled trial of automated classification of negation from clinical notes;Elkin;BMC Med. Inform. Decision Making,2005
2. Use of general-purpose negation detection to augment concept indexing of medical documents: a quantitative study using the UMLS;Mutalik;J. Am. Med. Inform. Assoc.,2001
3. Health Service Ombudsman for England, Errors in the care and treatment of a young woman with diabetes, 1998 (cited 2006 December 23), available from: http://www.ombudsman.org.uk/improving_services/special_reports/hsc/diabetes/index.html.
4. Centers for Medicare and Medicaid Services, Documentation Guidelines for Evaluation and Management Services, 1997 (cited 2006 December 12), available from: http://www.cms.hhs.gov/MedlearnProducts/downloads/1995dg.pdf.
5. Veterinary Terminology Services, 2006 (cited 2006 December 25), available from: http://terminology.vetmed.vt.edu/default.htm.