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(© 2004). Testosterone, Bioavailable and Sex Hormone Binding Globulin [9 paragraphs]. ARUP's Guide to Clinical Laboratory Testing [On-line information]. Available online: http://www.arup-lab.com/guides/clt/tests/clt_225b.jsp#1148913

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Patient's Guide to Low Testosterone, 2003 Edition [90 paragraphs]. Medem Medical Library, [On-line information by The Hormone Foundation and Endocrine Society]. Available online: http://www.medem.com/medlb/article_detaillb.cfm?article_ID=ZZZO7PDVDLC&sub_cat=57

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