1. Moore, R. (1966). Niels Bohr: the man, his science, & the world they changed, p. 196. Retrieved 13 April 2012 from http://en.wikiquote.org/wiki/Niels_Bohr .
2. Greg, E. W., Cheng, Y. J., Saydah, S., Cowie, C., Garfield, S., & Geiss, L. (2012). Trends in death rates among U.S. adults with and without diabetes between 1997 and 2006. Diabetes Care, 35, 1252–1257.
3. Roger, V. L., Go, A. S., Lloyd-Jones, D. M., Adams, R. J., Berry, J. D., Brown, T. M., et al. (2011). Heart disease and stroke statistics—2011 update: a report from the American Heart Association. Circulation, 123, e18–e209.
4. U.S Senate, Special Committee on Ageing (2011) Hearing examining the Food and Drug Administration’s (FDA) role in protecting patient safety as part of the medical device approval process, 13 April 2011. Retrieved 29 May 2012 from aging.senate.gov/hearing_detail.cfm?id=332494& .
5. Illinois Plaintiff’s Lawyer. Defective products, especially prostheses are not always recalled. Retrieved 29 May 2012 from illinoisplaintiffslawyer.com/?p=64 .