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Is a reference? http://content.nejm.org/cgi/reprint/356/1/68.pdf Cosnahang 15:13, 12 June 2007 (UTC)
Also http://jasn.asnjournals.org/cgi/content/full/10/9/1900?ck=nck
Cosnahang 15:17, 12 June 2007 (UTC)