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"What Causes CLL?." //Chronic Lymphocytic Leukemia Research Consortium (CRC)//.12 Apr 2009. .
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"Leukemia - Causes and Symptoms." //Washington University School of Medicine//. Copyright 2009 Washington University School of Medicine. 12 Apr 2009 .

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Fayed, Lisa. "About.com." //Can Leukemia Be Prevented?//. 02 June 2006. ©2009 About.com, a part of The New York Times Company.. 12 Apr 2009 .

Schoenstadt, Arthur. "MED TV." //Early Symptoms of Leukemia//. 27 Oct 2006. 12 Apr 2009 .