1. Clinical Laboratory Improvement Amendments (current document including all revisions through October, 2004). http://www.phppo.cdc.gov/clia/regs/toc.aspx
2. Associated Press (2003) http://www.cnn.com/2003/HEALTH/01/20/medical.mistake/
3. Pennsylvania Department of Health. http://www.dsf.health.state.pa.us/health/cwp/view.asp?A=190&Q=229407
4. Baltimore Sun. http://www.baltimoresun.com/news/local/bal-hospitaltests,0,7736886.storygallery?coll=bal-local-headlines
5. Kohn LT, Corrigan JM, Donaldson MS (1999) To error is human: building a safer health system. National Academy Press, Washington, DC