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J. Ruiz, M. Facer and R. K. Sun, “Risk Factors for Human Immunodeficiency Virus Infection and Unprotected Anal Intercourse among Young Men Who Have Sex with Men,” Sexually Transmitted Diseases, Vol. 25, No. 2, 1998, pp. 100-107.
doi:10.1097/00007435-199802000-00007
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