A multicenter study of viral hepatitis in a United States hemophilic population - Troisi, C L; Hollinger, F B; Hoots, W K; Contant, C; Gill, J; Ragni, M; Parmley, R; Sexauer, C; Gomperts, E; Buchanan, G; Schwartz, B; Adair, S; Fields, H (Blood, 1993)