http://kidney.niddk.nih.gov.libproxy.temple.edu/about/ResearchUpdates/KidneySum11/1.aspx

http://www.mdconsult.com.libproxy.temple.edu/das/citation/body/328307441-4/jorg=journal&source=MI&sp=23693374&sid=1293043164/N/23693374/1.html?issn=1046-6673

http://ovidsp.tx.ovid.com.libproxy.temple.edu/sp-3.5.1a/ovidweb.cgi?&S=IMENFPIMECDDNHFHNCALFFFBNIBMAA00&Link+Set=S.sh.15.16.19%7c11%7csl_10

http://www.hindawi.com/journals/jnume/2012/652608/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3263620/