1. http://www.fda.gov/cdrh/mda/docs/p030011.html
2. http://www.syncardia.com
3. http://content.nejm.org/cgi/content/short/351/9/859
4. http://www.fda.gov/cdrh/ode/H040006sum.html
5. Abiomed claims its 1st implanted artificial heart. http://www.businessweek.com/ap/financialnews/D9917PE80.htm .