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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1782355/
http://www.hindawi.com/journals/jbb/si/rccad/
http://www.immunotherapy-in-oncology.com/content.aspx?sc=1
http://www.immunotherapy-in-oncology.com/contentDirect.aspx?c=5
http://www.benthamscience.com/ccdt/samples/ccdt7-1/0003U.pdf