1. American Academy of Physician Assistants (AAPA) (2003 ) The physician-PA team . Available online at http://www.aapa.org/gandp/issuebrief/pateamb.pdf Last accessed 14 November 2007.
2. American Academy of Physician Assistants (AAPA) (2005 ) AAPA Physician Assistant Census Report . Available online at http://www.aapa.org/ Last accessed 14 November 2007.
3. American Association of Nurse Anesthetists (AANA) (2003 ) Nurse Anesthetists at a Glance . Available online at http://www.aana.com/aboutaana.aspx?ucNavMenu_TSMenuTargetID=179ucNavMenu_TSMenuTargettype=4ucNavMenu_TSMenuID=6id=265terms=Nurse+Anesthetists+at+a+glance Last accessed 14 November 2007.
4. American College of Nurse Practitioners (2006 ) What is a Nurse Practitioner? Available online at http://www.acnpweb.org/i4a/pages/index.cfm?pageid=3479 Last accessed 14 November 2007.