| http://www.w3.org/ns/prov#value | - In addition to these variables, other sociodemographic and clinical parameters including sex, years of education, risk factor for HIV infection (men who have sex with men, intravenous drug use, other), ethnicity (percentage Caucasian), hepatitis B and C virus infection, syphilis, substance abuse, and mortality were not significantly different between the NPD and non-NPD groups (data not shown).
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