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The American Journal of Medicine|June 1, 2005
Sildenafil use, sexual risk behavior, and risk for sexually transmitted diseases, including HIV infectionSean G Swearingen, Jeffrey D Klausner
Health Care Financing Review|February 3, 1992
Medigap preferred provider organizations: issues, implications, and early experienceL Nelson, G Swearingen, M Sing, et al.
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