Circumstances at HIV diagnosis and progression of disease in older HIV-infected Americans.

gan Zingmond, D S, Wenger, N S, Crystal, S, Joyce, G F, Liu, H, Sambamoorthi, U, Lillard, L A, Leibowitz, A A, Shapiro, M F, Bozzette, S A
Cyhoeddwyd 2001

National probability samples in studies of low-prevalence diseases. Part I: Perspectives and lessons from the HIV cost and services utilization study.

gan Shapiro, M F, Berk, M L, Berry, S H, Emmons, C A, Athey, L A, Hsia, D C, Leibowitz, A A, Maida, C A, Marcus, M, Perlman, J F, Schur, C L, Schuster, M A, Senterfitt, J W, Bozzette, S A
Cyhoeddwyd 1999