1. U.S. Renal Data Systems USRDS 2006 Annual Data Report: Atlas of End-Stage Renal Disease in the United States National Institutes of Health, National Institute of Diabetes and Digestive and Kidney Diseases 2006 http://www.usrds.org/adr.htm
2. International Federation of Renal Registries International Database 2006 http://www.ifrr.net
3. Societa’ Italiana Di Neprologia: Registro Italiano Dialisi E Trapianto 2006 http://www.sin-ridt.org.sin-ridt.org.htm
4. The Renal Association United Kingdom Renal Registry Report 2005 http://www.renalreg.com
5. Turkish Society of Nephrology: Registry of Nephrology, Dialysis and Transplantation in Turkey 2004 http://www.tsn.org.tr/registry_en.asp