[Observations on the classification of human immunodeficiency virus infection and associated diseases].
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D017088:AIDS-Related Opportunistic Infections / Q000145:classification* / Q000175:diagnosis; D000163:Acquired Immunodeficiency Syndrome / Q000145:classification / Q000175:diagnosis; D002487:Centers for Disease Control and Prevention, U.S.; D015658:HIV Infections / Q000145:classification* / Q000175:diagnosis; D015497:HIV-1; D006801:Humans; D014481:United States