Prevalence of antibodies to HIV-1 and HIV-2 in women attending a sexually transmitted disease clinic in Luanda, Angola. Issue 6 (December 1995) - Portincasa, P; Zannino, T; Dettori, G; Chezzi, C; Dos Santos, N; Vandunen, M; Lemos, C; Rubino, S; Cappuccinelli, P; Colombo, M M