1. ABNS. About the American Board of Neurological Surgeons—ABMS. Woodbridge, CT, 2012. http://www.abns.org/content/about_abns.asp (accessed 12 Oct 2012).
2. ABNS. Certification Process. Woodbridge, CT, 2012. http://www.abns.org/content/primary_certification_process.asp (accessed 12 Oct 2012).
3. ABR. About the American Board of Radiology. Tucson, AZ, 2012. http://www.theabr.org/about-landing (accessed 12 Oct 2012).
4. ABR. Core and Certifying Examinations. Tucson, AZ, 2012. http://www.theabr.org/eof-overview (accessed 12 Oct 2012).
5. Maintenance of certification: historical context;Hirsch;J Neurointerven Surg