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Unexplained CD4+ T-lymphocyte depletion in persons without evident HIV infection--United States. MMWR Morb Mortal Wkly Rep 41: 541-545, 1992."},{"key":"2","unstructured":"2. Kovacs JA, Hiemenz JW, Macher AM, et al. <i>Pneumocystis carinii<\/i> pneumonia: a comparison between patients with the acquired immunodeficiency syndrome and patients with other immunodeficiencies. Ann Intern Med 100: 663-671, 1984."},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. <i>Pneumocystis carinii<\/i> pneumonia in adults without predisposing illnesses. N Engl J Med 325: 1313-1315, 1991.","DOI":"10.1056\/NEJM199110313251813"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Duncan RA, von Reyn CF, Alliegro GM, Toossi Z, Sugar AM, Levitz SM. Idiopathic CD4+ T-lymphocytopenia--four patients with opportunistic infections and no evidence of HIV infection. N Engl J Med 328: 393-398, 1993.","DOI":"10.1056\/NEJM199302113280604"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. 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