"Risk of End-Stage Renal Disease Following Live Kidney Donation"  
JAMA
http://jama.jamanetwork.com/article.aspx?articleid=1829682
"Conclusions and Relevance  Compared with matched healthy nondonors, kidney donors had an increased risk of ESRD over a median of 7.6 years; however, the magnitude of the absolute risk increase was small. These findings may help inform discussions with persons considering live kidney donation."