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   <subfield code="a">Risk of AIDS in HIV seroconverters: A comparison between intravenous drug users and homosexual males</subfield>
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   <subfield code="c">[G. Rezza, A. Lazzarin, G. Angarano, R. Zerboni, A. Sinicco, B. Salassa, R. Pristerà, M. Barbanera, L. Ortona, F. Aiuti, P. Costigliola, S. Gafà, U. Tirelli, P. Pezzotti, F. Menniti-Ippolito]</subfield>
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