| http://www.w3.org/ns/prov#value | - rder (Bing et al. 2001).Apathy and IrritabilityApathy and irritability appear to be more specific markers of HIV-central nervous systeminvolvement (Castellon et al. 2000) than clinical syndromes such as anxiety or depression, andapathy in particular has been demonstrated to be qualitatively distinct from depression (Harriset al. 1994; Levy et al. 1998; Marin et al. 1994; Pflanz et al. 1991; Starks
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