1. Mid Staffs Public Inquiry 2010 Ken Lownds’s Statement (p157 of the 168-page statement), Item 20 of Cure the NHS document “Turning the NHS the right way up again” http://www.midstaffspublicinquiry.com/sites/default/files/evidence/Ken_Lownds_-_witness_statement_and_exhibits.pdf
2. The nature of adverse events in hospitalized patients. Results of the Harvard Medical Practice Study II;Leape;New England Journal of Medicine,1991
3. National Reporting and Learning System Quarterly Data Summary Issue 12, May 2009 http://www.nrls.npsa.nhs.uk/resources/collections/quarterly-data-summaries/?entryid45=59870
4. Health Service Ombudsman Care and Compassion? Report of the Health Service Ombudsman on Ten Investigations into NHS care of older people http://www.ombudsman.org.uk/improving-public-service/reports-and-consultations/reports/health/home